Materials Science and Engineering: A最新文献_第9页

Anomalous precipitation behavior in T-phase strengthened Al-Mg-Zn(-Cu) alloys: Effects of aging temperatures and Cu contents

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-04-01 DOI: 10.1016/j.msea.2025.148287

Songbai Tang , Xiaodong Wu , Lingfei Cao , Yan Zou , Min Bai , Yurong Yang

The anomalous precipitation behavior, characterized by a decline in hardening rates with increasing aging temperature, was systematically investigated in Al-Mg-Zn(-Cu) crossover alloys. Hardness testing, tensile testing and transmission electron microscopy (TEM) observation were employed to elucidate the relationships among aging temperature, Cu content and the hardening behavior, as well as relevant microstructural evolution. The results indicate that this unique behavior is associated with the evolution of T phase, which is strongly influenced by aging temperatures and Cu contents. High aging temperatures are detrimental to T-phase nucleation, resulting in the formation of low-density precursors with distinctive substructure unit of T″ phase at the early stage of aging. So that insufficient nuclei are provided for the subsequent development of hardening phase. During the prolonged aging at elevated temperatures, T phase undergoes rapid coarsening, leading to a significant reduction in the hardening potential of the alloys. Such detrimental effects of high-temperature aging can be mitigated by Cu addition, which enhances the density of precursors for T-phase and improves the thermal resistance of precipitates during the later aging stages. These beneficial effects become more pronounced with increasing Cu content. Based on these findings, strategies for designing high-strength Al-Mg-Zn(-Cu) alloys were outlined, emphasizing the control of early precursors of T phase through optimized aging treatments.

{"title":"Anomalous precipitation behavior in T-phase strengthened Al-Mg-Zn(-Cu) alloys: Effects of aging temperatures and Cu contents","authors":"Songbai Tang , Xiaodong Wu , Lingfei Cao , Yan Zou , Min Bai , Yurong Yang","doi":"10.1016/j.msea.2025.148287","DOIUrl":"10.1016/j.msea.2025.148287","url":null,"abstract":"<div><div>The anomalous precipitation behavior, characterized by a decline in hardening rates with increasing aging temperature, was systematically investigated in Al-Mg-Zn(-Cu) crossover alloys. Hardness testing, tensile testing and transmission electron microscopy (TEM) observation were employed to elucidate the relationships among aging temperature, Cu content and the hardening behavior, as well as relevant microstructural evolution. The results indicate that this unique behavior is associated with the evolution of T phase, which is strongly influenced by aging temperatures and Cu contents. High aging temperatures are detrimental to T-phase nucleation, resulting in the formation of low-density precursors with distinctive substructure unit of T″ phase at the early stage of aging. So that insufficient nuclei are provided for the subsequent development of hardening phase. During the prolonged aging at elevated temperatures, T phase undergoes rapid coarsening, leading to a significant reduction in the hardening potential of the alloys. Such detrimental effects of high-temperature aging can be mitigated by Cu addition, which enhances the density of precursors for T-phase and improves the thermal resistance of precipitates during the later aging stages. These beneficial effects become more pronounced with increasing Cu content. Based on these findings, strategies for designing high-strength Al-Mg-Zn(-Cu) alloys were outlined, emphasizing the control of early precursors of T phase through optimized aging treatments.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"933 ","pages":"Article 148287"},"PeriodicalIF":6.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving excellent cryogenic strength-ductility synergy of ultra-low carbon austenite stainless steel by cryogenic rolling and two-step annealing

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-31 DOI: 10.1016/j.msea.2025.148270

Wenping Sun , Bin Fu , Yanhui Guo , Yu Li , Linghuan Pang

This study proposes a novel processing method combining cryogenic rolling (cryo-rolling) and a two-step annealing process to further enhance the heterogeneity of 316L austenitic stainless steel. Deformation-induced martensite (DIM) was formed after cryo-rolling due to the reduction in stacking fault energy (SFE), accompanied by microstructural refinement and dislocation accumulation. After the first annealing at 700 °C, most of the DIM reverted to austenite with fine grains (FG, 1∼5 μm), while the stored energy was significantly reduced. In the second annealing at 750 °C, recrystallization became the dominant mechanism of microstructural evolution, resulting in a microstructure consisting of ultrafine grains (UFG, <1 μm), fine grains (FG), and coarse grains (CG, >5μm). After the two-step annealing process, an excellent combination of mechanical properties was achieved, including a yield strength (YS) of 1057 MPa, an ultimate tensile strength (UTS) of 1510 MPa, and a total elongation (EL) of 62.5%. The high YS primarily arises from UFG and dislocation strengthening. The enhancement of heterogeneity facilitated the interaction between UFG, FG, and CG, significantly improving the strain-hardening ability, which can primarily be attributed to the heterogeneous deformation-induced (HDI) effect in the early deformation stage. The transformation-induced plasticity (TRIP) effect was identified as the main mechanism in the later deformation stage.

{"title":"Achieving excellent cryogenic strength-ductility synergy of ultra-low carbon austenite stainless steel by cryogenic rolling and two-step annealing","authors":"Wenping Sun , Bin Fu , Yanhui Guo , Yu Li , Linghuan Pang","doi":"10.1016/j.msea.2025.148270","DOIUrl":"10.1016/j.msea.2025.148270","url":null,"abstract":"<div><div>This study proposes a novel processing method combining cryogenic rolling (cryo-rolling) and a two-step annealing process to further enhance the heterogeneity of 316L austenitic stainless steel. Deformation-induced martensite (DIM) was formed after cryo-rolling due to the reduction in stacking fault energy (SFE), accompanied by microstructural refinement and dislocation accumulation. After the first annealing at 700 °C, most of the DIM reverted to austenite with fine grains (FG, 1∼5 μm), while the stored energy was significantly reduced. In the second annealing at 750 °C, recrystallization became the dominant mechanism of microstructural evolution, resulting in a microstructure consisting of ultrafine grains (UFG, <1 μm), fine grains (FG), and coarse grains (CG, >5μm). After the two-step annealing process, an excellent combination of mechanical properties was achieved, including a yield strength (YS) of 1057 MPa, an ultimate tensile strength (UTS) of 1510 MPa, and a total elongation (EL) of 62.5%. The high YS primarily arises from UFG and dislocation strengthening. The enhancement of heterogeneity facilitated the interaction between UFG, FG, and CG, significantly improving the strain-hardening ability, which can primarily be attributed to the heterogeneous deformation-induced (HDI) effect in the early deformation stage. The transformation-induced plasticity (TRIP) effect was identified as the main mechanism in the later deformation stage.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"932 ","pages":"Article 148270"},"PeriodicalIF":6.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure evolution and related mechanical properties of additively manufactured Ti2AlC-modified Inconel 718 superalloy during long-term thermal exposure

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-29 DOI: 10.1016/j.msea.2025.148272

Huihui Wang , Qianying Guo , Chong Li , Lei Cui , Haining Yao , Yongchang Liu

Ti₂AlC has been shown to significantly enhance the mechanical properties of Inconel 718 (IN718). For its reliable application in high-temperature environments, understanding its microstructural evolution and mechanical behavior under prolonged thermal exposure is crucial but remains underexplored. This study investigates the microstructural evolution and mechanical properties of laser powder bed fusion (LPBF) fabricated Ti₂AlC-modified IN718 during long-term thermal exposure at 760 °C. The results reveal that (Ti, Nb)C carbides formed from Ti₂AlC decomposition coarsened according to the Lifshitz-Slyozov-Wagner (LSW) model, while σ phases nucleated and grew along grain boundaries adjacent to carbides. The thermal stability of γ″ and γ′ in co-precipitates inhibited the transformation of metastable γ″ to δ phases, contributing to microstructural stability. Cellular structures were stabilized by the pinning effects of (Ti, Nb)C carbides, with boundaries covered by elongated γ″ phases during thermal exposure. This led to Nb depletion within sub-grains, limiting γ″ growth in co-precipitates and driving a stacking sequence evolution from γ″/γ′/γ″ to γ′/γ″/γ′. The coarsening of elongated γ″ precipitates triggered a transition in deformation mechanisms from dislocation shearing to micro-twinning. In regions where cellular structures were annihilated, γ′ and γ″ coarsened slowly, with some γ″/γ′/γ″ evolving into γ′/γ″ duplets, maintaining shearing as the dominant deformation mechanism. Tensile tests at 650 °C demonstrated a continuous decrease in yield strength (YS), primarily attributed to the coarsening of σ phases and the reduction in γ″/γ′/γ″ triplets. Conversely, ductility improved significantly from 9.6 % to 21.1 %, driven by the activation of micro-twinning and enhanced dislocation motion facilitated by coarsened precipitates. These findings highlight the importance of Ti₂AlC in stabilizing the microstructure and optimizing the high-temperature performance of IN718 alloys under prolonged thermal exposure.

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引用次数: 0

Fatigue strength optimization of compacted graphite cast iron processed by austempering process

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-29 DOI: 10.1016/j.msea.2025.148271

X.Y. Teng , B.Z. Tan , J.C. Pang , Y. Chen , C.L. Zou , F. Shi , S.X. Li , Z.F. Zhang

The fatigue property optimization of compacted graphite cast iron (CGI) by the austempering process was investigated. The austenitizing at 850 °C firstly then austempering at 280 °C and 370 °C respectively were selected. The tensile and fatigue properties and corresponding damage mechanism of the CGI and austempered CGI (ACGI) samples were carried out. The highest fatigue strength of 221 MPa for CGI materials was obtained by austempering at 370 °C. The fatigue strength decreases first and then increases in CGI and ACGI samples with the increase of austempering temperature. The general relation between the tensile and fatigue strength of CGI was further investigated. The corresponding physical significance in the relations was proposed based on the different defect morphologies in cast iron alloys, which provides implications for understanding the relation between metal fatigue and tensile strength and optimizing fatigue properties.

引用次数: 0

Study on the forming limit of TA1 pure titanium foils based on digital image correlation: Experiments and predictive models

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-28 DOI: 10.1016/j.msea.2025.148267

Peisheng Han , Jixin Yang , Fengyuan Yang , Zixing Cheng , Xiaogang Wang

At the micro/mesoscopic scale, traditional macroscopic methods, theories, and models used to determine the forming limit are not entirely suitable, given the impact of the size effect on mechanical response, plastic deformation, and fracture. To accurately predict the failure of metal foils during microforming processes, taking into account the size effect on the forming limit. This study constructed tension-compression forming limit diagrams (FLD) for TA1 pure titanium (Ti) foils at thicknesses of 0.08 mm, 0.1 mm, and 0.2 mm based on digital image correlation (DIC). Specifically, it implemented Holmberg uniaxial tensile testing, model prediction based on the modified Oyane ductile fracture criterion, and the fully connected neural network (FCNN). It is found that the forming limit of TA1 pure Ti foils increases with larger specimen thickness. For foils of the same thickness, the forming limit rises with the decrease in the ratio of specimen thickness to grain size (t/d). Additionally, as t/d increases, the influence of the strain rate sensitivity on the overall strain state of the material diminishes, creating similar strain states of specimens in different strain paths. By analyzing the FLD constructed in three methods, it is found that with the t/d and Hill48 yield criteria, the modified Oyane ductile fracture criterion effectively predicted the size effect. After appropriate training, the FCNN model with optimal topology also achieved a high-accuracy prediction of the forming limit.

在微观/介观尺度上，由于尺寸效应对机械响应、塑性变形和断裂的影响，用于确定成形极限的传统宏观方法、理论和模型并不完全适用。为了准确预测金属箔在微成形过程中的失效，同时考虑到尺寸效应对成形极限的影响。本研究基于数字图像相关（DIC），构建了厚度为 0.08 毫米、0.1 毫米和 0.2 毫米的 TA1 纯钛（Ti）箔的拉伸-压缩成形极限图（FLD）。具体而言，它采用了 Holmberg 单轴拉伸试验、基于修正的 Oyane 延展性断裂准则的模型预测和全连接神经网络（FCNN）。结果发现，TA1 纯钛箔的成形极限随试样厚度的增加而增加。对于相同厚度的薄片，成形极限随着试样厚度与晶粒尺寸之比（t/d）的减小而升高。此外，随着 t/d 的增大，应变速率敏感性对材料整体应变状态的影响减小，从而在不同的应变路径中产生相似的试样应变状态。通过分析用三种方法构建的 FLD，发现在 t/d 和 Hill48 屈服准则下，改进的 Oyane 延展性断裂准则能有效预测尺寸效应。经过适当的训练后，具有最佳拓扑结构的 FCNN 模型也实现了对成形极限的高精度预测。

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引用次数: 0

Solidified structure and mechanical properties control of 2319 aluminum alloy for ultrasonic vibration-assisted arc-directed energy deposition with different amplitudes

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-28 DOI: 10.1016/j.msea.2025.148265

Xin Meng , Xingrong Chu , Zhonggang Sun , Yanhua Guo , Guoqing Dai , Wenya Li

This study utilized ultrasonic vibration (UV) as an auxiliary method for 2319 Al-Cu alloy prepared by arc-directed energy deposition (arc-DED) to address the poor internal quality and mechanical properties of arc-DEDed components due to high heat input and thermal cycling effects. The effects of different ultrasonic amplitudes on the solidification structure and mechanical properties of Al-Cu alloys were investigated. Results indicated that applying UV with 10 μm amplitude effectively suppresses metallurgical defects in the microstructure of as-built 2319 aluminum alloy and cleanses their inter-layer interfaces. Compared with the non-UV sample, under the action of UV with the amplitude of 10 μm, the grain size refinement reaches a maximum of 25 %. UV improves molten pool fluidity and reduces temperature gradients. However, UV with large amplitude can trigger excessive ultrasound heat effects and intense cavitation behavior, which is not conducive to improving the uniformity and refinement of the solidified microstructure. After UV treatment, the elongation of arc-DEDed 2319 Al-Cu alloy significantly increases, with improvements of 111.9 % (amplitude of 10 μm), 88.1 % (amplitude of 20 μm), and 61.2 % (amplitude of 30 μm) under different amplitude conditions. The UV with 10 μm amplitude can transform the intergranular fracture induced by pores and brittle second phases in the non-vibrated specimens into transgranular fracture, significantly enhancing the plasticity and toughness of the material. Based on this, the UV with 10 μm amplitude plays a significant role in grain refinement, defect healing, and the improvement of mechanical properties.

{"title":"Solidified structure and mechanical properties control of 2319 aluminum alloy for ultrasonic vibration-assisted arc-directed energy deposition with different amplitudes","authors":"Xin Meng , Xingrong Chu , Zhonggang Sun , Yanhua Guo , Guoqing Dai , Wenya Li","doi":"10.1016/j.msea.2025.148265","DOIUrl":"10.1016/j.msea.2025.148265","url":null,"abstract":"<div><div>This study utilized ultrasonic vibration (UV) as an auxiliary method for 2319 Al-Cu alloy prepared by arc-directed energy deposition (arc-DED) to address the poor internal quality and mechanical properties of arc-DEDed components due to high heat input and thermal cycling effects. The effects of different ultrasonic amplitudes on the solidification structure and mechanical properties of Al-Cu alloys were investigated. Results indicated that applying UV with 10 μm amplitude effectively suppresses metallurgical defects in the microstructure of as-built 2319 aluminum alloy and cleanses their inter-layer interfaces. Compared with the non-UV sample, under the action of UV with the amplitude of 10 μm, the grain size refinement reaches a maximum of 25 %. UV improves molten pool fluidity and reduces temperature gradients. However, UV with large amplitude can trigger excessive ultrasound heat effects and intense cavitation behavior, which is not conducive to improving the uniformity and refinement of the solidified microstructure. After UV treatment, the elongation of arc-DEDed 2319 Al-Cu alloy significantly increases, with improvements of 111.9 % (amplitude of 10 μm), 88.1 % (amplitude of 20 μm), and 61.2 % (amplitude of 30 μm) under different amplitude conditions. The UV with 10 μm amplitude can transform the intergranular fracture induced by pores and brittle second phases in the non-vibrated specimens into transgranular fracture, significantly enhancing the plasticity and toughness of the material. Based on this, the UV with 10 μm amplitude plays a significant role in grain refinement, defect healing, and the improvement of mechanical properties.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"932 ","pages":"Article 148265"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deformation driven enhancement of strength-ductility synergy of a PM AA6061-10Cu hybrid material

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-28 DOI: 10.1016/j.msea.2025.148268

Meiying Zhao , Yufeng Zhang , Dianhua Zhang , Deliang Zhang

A powder metallurgy (PM) AA6061-10Cu hybrid material was fabricated by a thermomechanical consolidation technique involving hot extrusion of the compact of an AA6061 aluminum alloy and Cu powder blend. By increasing the extrusion ratio from 9:1 to 25:1, both the yield strength (YS), ultimate tensile strength (UTS) and elongation to fracture (EL) of the material all increased significantly from 122 MPa, 207 MPa and 6.8 % to 155 MPa, 256 MPa and 8.9 %. This clearly signifies the deformation driven enhancement of strength-ductility synergy of the PM hybrid material. After a tailored T6 heat treatment, the superior tensile properties associated with increased deformation were maintained, with the YS and UTS increasing from 189 to 253 MPa to 246 and 297 MPa, while maintaining the EL at 5.8 %. In both states, the improvement of strength is attributed to nano-precipitate strengthening from the high volume fractions of Al₂Cu, Al-(Fe, Cr, Si) and Al-(Fe, Cr) precipitates, grain boundary strengthening due to the refinement and increased volume fraction of recrystallized grains, and dislocation strengthening within the Cu particles. The significant improvement in ductility of the as-extruded hybrid material is attributed to the promotion of coordinated deformation facilitated by the high density geometrically necessary dislocations (GNDs) resulting from the pronounced size disparity between dynamic recrystallized (DRXed) and deformed grains in the matrix, as well as the substantial increase in the volume fraction of DRXed grains, which provides strong support for grain boundary sliding and rotation within the grain layer, positively influencing strain continuity at the AA6061/Cu interface. These findings offer new insights for hybrid material design to achieve superior mechanical performance.

{"title":"Deformation driven enhancement of strength-ductility synergy of a PM AA6061-10Cu hybrid material","authors":"Meiying Zhao , Yufeng Zhang , Dianhua Zhang , Deliang Zhang","doi":"10.1016/j.msea.2025.148268","DOIUrl":"10.1016/j.msea.2025.148268","url":null,"abstract":"<div><div>A powder metallurgy (PM) AA6061-10Cu hybrid material was fabricated by a thermomechanical consolidation technique involving hot extrusion of the compact of an AA6061 aluminum alloy and Cu powder blend. By increasing the extrusion ratio from 9:1 to 25:1, both the yield strength (YS), ultimate tensile strength (UTS) and elongation to fracture (EL) of the material all increased significantly from 122 MPa, 207 MPa and 6.8 % to 155 MPa, 256 MPa and 8.9 %. This clearly signifies the deformation driven enhancement of strength-ductility synergy of the PM hybrid material. After a tailored T6 heat treatment, the superior tensile properties associated with increased deformation were maintained, with the YS and UTS increasing from 189 to 253 MPa to 246 and 297 MPa, while maintaining the EL at 5.8 %. In both states, the improvement of strength is attributed to nano-precipitate strengthening from the high volume fractions of Al<sub>2</sub>Cu, Al-(Fe, Cr, Si) and Al-(Fe, Cr) precipitates, grain boundary strengthening due to the refinement and increased volume fraction of recrystallized grains, and dislocation strengthening within the Cu particles. The significant improvement in ductility of the as-extruded hybrid material is attributed to the promotion of coordinated deformation facilitated by the high density geometrically necessary dislocations (GNDs) resulting from the pronounced size disparity between dynamic recrystallized (DRXed) and deformed grains in the matrix, as well as the substantial increase in the volume fraction of DRXed grains, which provides strong support for grain boundary sliding and rotation within the grain layer, positively influencing strain continuity at the AA6061/Cu interface. These findings offer new insights for hybrid material design to achieve superior mechanical performance.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"932 ","pages":"Article 148268"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated manufacturing method for compressor blisks: LDED Ti65 on sheet Ti-6Al-4V

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-27 DOI: 10.1016/j.msea.2025.148266

Junfeng Sun, Haifei Lu, Yuchen Liang, Kaiyu Luo, Jinzhong Lu

This research focuses on the integrated manufacturing technology of aero-engine compressor blisks, especially the deposition of Ti65 powder on a Ti-6Al-4V substrate using laser direct energy deposition (LDED). The microstructure, microhardness, and tensile properties of the samples were investigated. The analysis revealed that the microstructure of the specimens can be divided into LDED-Ti65, heat-affected zone (HAZ), and Ti-6Al-4V substrate. The microstructure of Ti65 exhibited different morphologies of α laths. Ti-6 A l-4V presented a bimodal microstructure. The HAZ formed a gradient microstructure comprising lamellar α, α laths, as well as residual β-transformed (β_t) structure and primary α (α_p). The HAZ's lowest microhardness (339 HV) was attributed to the cyclic thermal effects during deposition, which dissolved α_p and secondary α (α_s). The ultimate tensile strength (UTS) and yield strength (YS) of the HAZ specimens were 1005 ± 10 MPa and 910 ± 8 MPa, respectively, with a maximum elongation (δ) of 11.5 ± 0.5 %. The excellent ductility was attributed to angular grain boundary ratios and finer α adjustment. Using the digital image correlation (DIC) technique, stress concentration and inhomogeneous deformation were observed to occur first in the HAZ. The inhomogeneity of plastic strain was microstructure-dependent. Loading-unloading-reloading tests (LUR) showed that strain hardening induced by the gradient microstructure of the HAZ during plastic deformation enhanced the ductility of the specimen through a synergistic effect.

{"title":"Integrated manufacturing method for compressor blisks: LDED Ti65 on sheet Ti-6Al-4V","authors":"Junfeng Sun, Haifei Lu, Yuchen Liang, Kaiyu Luo, Jinzhong Lu","doi":"10.1016/j.msea.2025.148266","DOIUrl":"10.1016/j.msea.2025.148266","url":null,"abstract":"<div><div>This research focuses on the integrated manufacturing technology of aero-engine compressor blisks, especially the deposition of Ti65 powder on a Ti-6Al-4V substrate using laser direct energy deposition (LDED). The microstructure, microhardness, and tensile properties of the samples were investigated. The analysis revealed that the microstructure of the specimens can be divided into LDED-Ti65, heat-affected zone (HAZ), and Ti-6Al-4V substrate. The microstructure of Ti65 exhibited different morphologies of α laths. Ti-6 A l-4V presented a bimodal microstructure. The HAZ formed a gradient microstructure comprising lamellar α, α laths, as well as residual β-transformed (β<sub>t</sub>) structure and primary α (α<sub>p</sub>). The HAZ's lowest microhardness (339 HV) was attributed to the cyclic thermal effects during deposition, which dissolved α<sub>p</sub> and secondary α (α<sub>s</sub>). The ultimate tensile strength (UTS) and yield strength (YS) of the HAZ specimens were 1005 ± 10 MPa and 910 ± 8 MPa, respectively, with a maximum elongation (δ) of 11.5 ± 0.5 %. The excellent ductility was attributed to angular grain boundary ratios and finer α adjustment. Using the digital image correlation (DIC) technique, stress concentration and inhomogeneous deformation were observed to occur first in the HAZ. The inhomogeneity of plastic strain was microstructure-dependent. Loading-unloading-reloading tests (LUR) showed that strain hardening induced by the gradient microstructure of the HAZ during plastic deformation enhanced the ductility of the specimen through a synergistic effect.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"932 ","pages":"Article 148266"},"PeriodicalIF":6.1,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Serration behavior and brittle phase-induced mechanical transitions in wrought Al0.3CoCrFeNi high-entropy alloy from 100°C to 800°C 100°C 至 800°C 锻造 Al0.3CoCrFeNi 高熵合金中的锯齿行为和脆性相诱导的力学转变

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-27 DOI: 10.1016/j.msea.2025.148261

Yaqi Wu , Jamieson Brechtl , Changwei Li , Peter K. Liaw , Guihong Geng , Yong Zhang

In this work, the serrated flows and temperature-dependent behavior of Al0.3CoCrFeNi were investigated. The refined composite multiscale entropy (RCMSE) method was used to model and analyze the serration behavior. The results revealed that serrated flow exhibited dynamically complex behavior, with complexity increasing with temperature. Experimental results showed that the serration type changed from type-A (regular, high-frequency serrations associated with dynamic strain aging (DSA) effects) and type B (irregular, medium-frequency serrations linked to localized dislocation motion) to type-C (low-frequency, large-amplitude serrations caused by interactions between deformation twins and dislocations) between 300°C and 600°C due to the transition from dynamic strain aging (DSA) effects to interactions between deformation twins and dislocations. Additionally, grain boundary segregation led to a transition from ductile to brittle fracture at 700°C. These findings highlight the significance of understanding serration and temperature-dependent behaviors during the deformation of the Al0.3 alloy, which is crucial for research on the temperature-dependent failure and application of high-entropy alloys.

{"title":"Serration behavior and brittle phase-induced mechanical transitions in wrought Al0.3CoCrFeNi high-entropy alloy from 100°C to 800°C","authors":"Yaqi Wu , Jamieson Brechtl , Changwei Li , Peter K. Liaw , Guihong Geng , Yong Zhang","doi":"10.1016/j.msea.2025.148261","DOIUrl":"10.1016/j.msea.2025.148261","url":null,"abstract":"<div><div>In this work, the serrated flows and temperature-dependent behavior of Al0.3CoCrFeNi were investigated. The refined composite multiscale entropy (RCMSE) method was used to model and analyze the serration behavior. The results revealed that serrated flow exhibited dynamically complex behavior, with complexity increasing with temperature. Experimental results showed that the serration type changed from type-A (regular, high-frequency serrations associated with dynamic strain aging (DSA) effects) and type B (irregular, medium-frequency serrations linked to localized dislocation motion) to type-C (low-frequency, large-amplitude serrations caused by interactions between deformation twins and dislocations) between 300°C and 600°C due to the transition from dynamic strain aging (DSA) effects to interactions between deformation twins and dislocations. Additionally, grain boundary segregation led to a transition from ductile to brittle fracture at 700°C. These findings highlight the significance of understanding serration and temperature-dependent behaviors during the deformation of the Al0.3 alloy, which is crucial for research on the temperature-dependent failure and application of high-entropy alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"932 ","pages":"Article 148261"},"PeriodicalIF":6.1,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tensile compression yield asymmetry of Mg-Zn-Y-Gd-Zr alloy in extruded and annealed states

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-03-27 DOI: 10.1016/j.msea.2025.148263

M.R. Afshar , A. Zarei-Hanzaki , M. Tahaghoghi , M. Mosayebi , N. Bassim , H.R. Abedi

This study investigates the microstructural changes and mechanical response of GWZ magnesium alloy at room temperature, aiming to understand the factors contributing to the asymmetry observed in tensile and compressive yield behavior. After a long-time annealing treatment, various microstructural features such as texture, grain size, long period stacking ordered (LPSO) phase, and crystal orientation undergo changes, which allows for the investigation of their combined effects on the mechanical properties and yield-asymmetry. The yield-asymmetry of the alloy in the extruded condition was found to be 1.08, increasing to about 1.22 after heat treatment. Annealing creates new texture components that are favorable for extension/contraction twinning. Additionally, the increase in average grain size after annealing increases the probability of extension twin formation. Increasing the twin probability and decreasing the slip-to-twin transfer critical stress enhances the difference between tensile and compressive yield strengths. Additionally, the mentioned phenomenon is the reason for the lower strength level, higher ductility, and higher yield asymmetry of the annealed specimens. Fraction of blocky-LPSO also diminished through annealing, giving way to the formation of lamellar-LPSO within α-grains. Under tensile loading, lamellar LPSO exhibits structural integrity, while under compression, yielding occurs through the formation of kink bands. The high susceptibility of lamellar LPSO for strain induced structural evolution rather than blocky ones, could justify the observed low yield-asymmetry of extruded microstructure.

{"title":"Tensile compression yield asymmetry of Mg-Zn-Y-Gd-Zr alloy in extruded and annealed states","authors":"M.R. Afshar , A. Zarei-Hanzaki , M. Tahaghoghi , M. Mosayebi , N. Bassim , H.R. Abedi","doi":"10.1016/j.msea.2025.148263","DOIUrl":"10.1016/j.msea.2025.148263","url":null,"abstract":"<div><div>This study investigates the microstructural changes and mechanical response of GWZ magnesium alloy at room temperature, aiming to understand the factors contributing to the asymmetry observed in tensile and compressive yield behavior. After a long-time annealing treatment, various microstructural features such as texture, grain size, long period stacking ordered (LPSO) phase, and crystal orientation undergo changes, which allows for the investigation of their combined effects on the mechanical properties and yield-asymmetry. The yield-asymmetry of the alloy in the extruded condition was found to be 1.08, increasing to about 1.22 after heat treatment. Annealing creates new texture components that are favorable for extension/contraction twinning. Additionally, the increase in average grain size after annealing increases the probability of extension twin formation. Increasing the twin probability and decreasing the slip-to-twin transfer critical stress enhances the difference between tensile and compressive yield strengths. Additionally, the mentioned phenomenon is the reason for the lower strength level, higher ductility, and higher yield asymmetry of the annealed specimens. Fraction of blocky-LPSO also diminished through annealing, giving way to the formation of lamellar-LPSO within α-grains. Under tensile loading, lamellar LPSO exhibits structural integrity, while under compression, yielding occurs through the formation of kink bands. The high susceptibility of lamellar LPSO for strain induced structural evolution rather than blocky ones, could justify the observed low yield-asymmetry of extruded microstructure.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"932 ","pages":"Article 148263"},"PeriodicalIF":6.1,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0