Materials Characterization最新文献_第8页

Shear localization and shear banding: A review about the complex interplay between material, microstructural and process variables 剪切定位和剪切带：材料、微结构和工艺变量之间复杂的相互作用综述

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-29 DOI: 10.1016/j.matchar.2024.114501

Ashoktaru Chakraborty, Shibayan Roy

Shear localization and shear band formation in metals, alloys and composites is an important deformation phenomenon most commonly associated with high strain rate deformation. It generally occurs as a thermo-mechanical instability where thermal softening due to adiabatic heating subdues strain hardening. The review presents different facets of strain localization and eventual shear band formation in various materials primarily including pure metals, alloys and composites. It starts with the dependence of shear band formation on materials parameters (e.g. crystal structure, stacking fault energy, c/a ratio, twining and TRIP effect etc.) and process variables (strain rate, stress states etc.) are presented. Effect of microstructural heterogeneities like twinning, grain boundary, phase boundary, particulates etc. are then discussed along with orientation variables (micro- and bulk texture etc.). Various aspects of microstructure and texture evolution due to strain localization in and around the shear bands are further demonstrated e.g. heat accumulation leading to dynamic recrystallization, phase transformation amorphization, evolution of Brass type texture due to shear banding etc. Theoretical simulations and modeling efforts pertaining to shear band formation, mostly crystal plasticity finite element based and resulting texture evolution is presented. Finally, an extensive review is carried out about the shear location and shear band formation for various metallic nanolayered composites. The present review therefore should be useful in understanding the root causes of shear localization and shear band formation e.g. during fabricating components for fracture-critical applications.

金属、合金和复合材料中的剪切定位和剪切带形成是一种重要的变形现象，通常与高应变速率变形有关。它通常是一种热机械不稳定现象，即绝热加热导致的热软化抑制了应变硬化。综述介绍了各种材料（主要包括纯金属、合金和复合材料）中应变局部化和最终剪切带形成的不同方面。文章首先介绍了剪切带形成对材料参数（如晶体结构、堆积断层能、c/a 比、缠绕和 TRIP 效应等）和工艺变量（应变速率、应力状态等）的依赖性。然后讨论了孪晶、晶界、相界、微粒等微结构异质性的影响以及取向变量（微观和整体纹理等）。此外，还进一步论证了剪切带内部和周围应变局部化导致的微观结构和纹理演变的各个方面，例如导致动态再结晶的热积累、相变变质、剪切带导致的黄铜型纹理演变等。此外，还介绍了与剪切带形成有关的理论模拟和建模工作，主要是基于晶体塑性的有限元模拟和由此产生的纹理演变。最后，还对各种金属纳米层复合材料的剪切位置和剪切带形成进行了广泛综述。因此，本综述有助于了解剪切定位和剪切带形成的根本原因，例如在制造用于断裂关键应用的部件时。

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引用次数: 0

Effect of ECAP and aging on microstructure of an Al-Cu-Mg-Si alloy ECAP 和时效对铝铜镁硅合金微观结构的影响

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-29 DOI: 10.1016/j.matchar.2024.114500

M.R. Gazizov , S.Yu. Mironov , R. Holmestad , M.Yu. Gazizova , R.O. Kaibyshev

The effect of equal-channel-angular pressing (ECAP) on the microstructure and precipitation of an Al-4.7Cu-0.74 Mg-0.51Si-0.48Mn-0.10Cr-0.09Ti-0.02Fe (all wt%) has been studied using aberration-corrected scanning transmission electron microscopy. The ECAP followed by a short-term aging provides a superior combination of strength and ductility in the present alloy. The ECAPed alloy shows a substantially different precipitation behavior in the deformation bands (DBs) compared to extended regions (ERs) during aging. The relatively coarse particles of the equilibrium θ (Al₂Cu) and β (Mg₂Si) phases were found to form along deformation-induced grain/subgrain boundaries within the DBs after short-term aging. In the present alloy after ECAP and aging, the phases continuously decorating dislocation lines or forming the discrete particles in the ERs are similar to those in the bulk matrix after conventional aging. The macroscopic strengths have been estimated for the ERs and DBs in the samples after ECAP and aging. The former, i.e., ERs, with predominant strengthening contributions originating from solid solution, precipitation and dislocations, is likely have a higher YS than the latter with the relatively coarse equilibrium particles and mainly strengthened by only grain boundaries and dislocations.

使用畸变校正扫描透射电子显微镜研究了等沟道角压（ECAP）对 Al-4.7Cu-0.74Mg-0.51Si-0.48Mn-0.10Cr-0.09Ti-0.02Fe（所有重量百分比）的微观结构和析出的影响。经过 ECAP 和短期时效处理后，该合金的强度和延展性得到了很好的结合。在老化过程中，ECAP 合金在变形带（DBs）和扩展区（ERs）的析出行为大不相同。在短期时效后，发现平衡θ（Al2Cu）和β（Mg2Si）相的相对较粗颗粒沿着变形引起的晶粒/亚晶粒边界在 DBs 内形成。在本合金中，经过 ECAP 和时效后，ERs 中不断装饰位错线或形成离散颗粒的相与常规时效后的块状基体中的相类似。对经过 ECAP 和时效处理的样品中的 ER 和 DB 进行了宏观强度估算。前者（即ERs）的主要强化作用来自固溶体、沉淀和位错，其YS值可能高于后者（后者的平衡颗粒相对较粗，主要强化作用仅来自晶界和位错）。

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引用次数: 0

Mo-Ni foam interlayer deposited pyrolytic carbon for brazing C/C and nickel-based superalloy 用于钎焊碳/碳和镍基超耐热合金的镍钼泡沫夹层沉积热解碳

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-29 DOI: 10.1016/j.matchar.2024.114502

Jinhua Lu , Wenqi Liu , Binyao Cao , Zhaofan Zhou , Yi Cao , Ruoxi Zhang , Shouyang Zhang , Ruimei Yuan , Hejun Li

C/C composites possess both lightweight and high-strength properties, and joining them with superalloys can reduce the mass of the joints and construct ultra-high heat flux lightweight cooling components, which are widely used in the hot end of a nuclear reactor. Nonetheless, significant residual stress caused by thermal mismatch is the counterpart when brazing C/C composites and metals. This increases the initiation of the joint cracks. In this study, a new method of deposition pyrolytic carbon (PyC) on the Mo-Ni skeleton to help braze C/C composites and nickel-based superalloys was proposed. With the protection of a uniformly distributed PyC layer, the corrosion and dissolution of the metal skeleton by the brazing material can be effectively mitigated. The low coefficient of thermal expansion (CTE) of the PyC layer mitigates the thermal mismatch of the joint, while the high plastic deformation capacity of the skeleton effectively mitigates the residual stresses. The two mechanisms cooperate to increase joint strength. To enhance the chemical bonding of the joint, a modification of Ti powder was implemented. The synergistic reinforcement of PyC-modified Mo-Ni foam (C-MN) and Ti powder-modified brazing material was utilized to effectively enhance the shear strength of the joint to ∼41 MPa, a 163 % improvement over unmodified joints. This work can provide a new idea for the preparation of high-performance C/C composites and joining materials for metals.

C/C 复合材料具有轻质和高强度的特性，将其与超合金连接可减轻连接处的质量，并建造超高热通量的轻质冷却组件，这些组件被广泛应用于核反应堆的热端。然而，在将 C/C 复合材料与金属进行钎焊时，热不匹配会导致大量残余应力。这增加了接头裂纹的产生。本研究提出了一种在钼镍骨架上沉积热解碳（PyC）的新方法，以帮助钎焊碳/碳复合材料和镍基超合金。在均匀分布的 PyC 层的保护下，钎焊材料对金属骨架的腐蚀和溶解可以得到有效缓解。PyC 层的低热膨胀系数（CTE）可减轻接头的热失配，而骨架的高塑性变形能力可有效减轻残余应力。这两种机制相互配合，提高了连接强度。为了增强接合处的化学结合，对钛粉进行了改性。利用 PyC 改性钼镍泡沫（C-MN）和钛粉改性钎料的协同增强作用，有效地将接头的剪切强度提高到了 41 兆帕，比未改性接头提高了 163%。这项研究为制备高性能 C/C 复合材料和金属连接材料提供了新思路。

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引用次数: 0

Effects of heat input on microstructure evolution and corrosion resistance of underwater laser cladding high-strength low-alloy steel coating 热输入对水下激光熔覆高强度低合金钢涂层微观结构演变和耐腐蚀性的影响

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-28 DOI: 10.1016/j.matchar.2024.114498

Qi Cheng , Ning Guo , Zhenyu Xue , Hao Chen , Junhui Tong , Yuchao Ding , Yunlong Fu , Guanchen Zhou

The effects of heat input on the microstructure evolution and corrosion resistance of the high-strength low-alloy (HSLA) steel coating obtained by wire-feed underwater laser cladding were studied. Optical digital microscope, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscope (TEM), electron back-scattered diffraction (EBSD), electrochemical tests, laser microscope and other characterization methods were used. As the heat input increased, the smoothness of the underwater cladding coating improved, with little changes in elemental distribution and phase composition. However, the content of acicular ferrite increased, while the amounts of lath bainite, lath martensite, and granular bainite decreased. As the heat input increased from 0.4 to 0.55 kJ/mm, the grain size increased from 25.3 to 55.9 μm, the proportion of low-angle grain boundaries rose from 61.3 % to 69.1 %, and the texture intensity of the (110) crystal plane increased from 16.22 to 23.83. Meanwhile, the dislocation density decreased from 4.9 × 10¹⁴ to 4.1 × 10¹⁴ m⁻². These changes enhanced the corrosion resistance of underwater coating. As the heat input increased from 0.4 to 0.55 kJ/mm, the corrosion current density decreased from 2.13 × 10⁻⁵ to 3.35 × 10⁻⁶ A/cm², and the corrosion potential increased from −0.823 to −0.529 V. Additionally, the depth-to-width ratio of the corrosion pits decreased from 0.255 to 0.053. This study laid the foundation for high-quality in-situ underwater repairs of ships and submarines made of high-strength steel.

研究了热量输入对水下激光熔覆高强度低合金（HSLA）钢涂层微观结构演变和耐腐蚀性能的影响。采用了光学数码显微镜、扫描电子显微镜（SEM）、能量色散 X 射线光谱（EDS）、X 射线衍射（XRD）、透射电子显微镜（TEM）、电子背散射衍射（EBSD）、电化学测试、激光显微镜等表征方法。随着热输入的增加，水下包覆层的光滑度有所提高，元素分布和相组成变化不大。不过，针状铁素体的含量有所增加，而板条贝氏体、板条马氏体和粒状贝氏体的含量则有所减少。随着热输入从 0.4 kJ/mm 增加到 0.55 kJ/mm，晶粒尺寸从 25.3 μm 增加到 55.9 μm，低角度晶界比例从 61.3 % 增加到 69.1 %，(110) 晶面的纹理强度从 16.22 增加到 23.83。同时，位错密度从 4.9 × 1014 m-2 降至 4.1 × 1014 m-2。这些变化增强了水下涂层的耐腐蚀性。当输入热量从 0.4 kJ/mm 增加到 0.55 kJ/mm 时，腐蚀电流密度从 2.13 × 10-5 下降到 3.35 × 10-6 A/cm2，腐蚀电位从 -0.823 V 上升到 -0.529 V，此外，腐蚀坑的深宽比从 0.255 下降到 0.053。这项研究为高强度钢制成的舰船和潜艇的高质量水下原位修复奠定了基础。

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引用次数: 0

Tailoring the microstructure by prior treatment to achieve 37.6 GPa·% PSE in a room-temperature quenched and partitioned steel 通过先期处理调整微观结构，使室温淬火隔热钢的 PSE 达到 37.6 GPa-% 的水平

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-26 DOI: 10.1016/j.matchar.2024.114497

Xu Wang , Yunbo Xu , Jiapeng Guo , Yuan Wang , Jingyi Ren , R.D.K. Misra

In this work, different initial microstructures, including deformed cold-rolled structure, quenched martensite, granular bainite, and lathy bainite, were intentionally designed through cold rolling and prior treatment. Meanwhile, a novel room-temperature quenching and partitioning (RT-Q&P) process was proposed to further enhance strength-ductility combination of Cu-Ni bearing Q&P. The present study aims to investigate the influences of initial microstructures on the formation kinetics of austenite, the mechanical stability of RA, microstructure evolution, and mechanical performance in Q&P steel treated by RT-Q&P process. Compared to sample without prior treatment, samples with prior treatment showed a larger austenization degree due to more nucleation sites on martensite/bainite matrix. DICTRA simulation indicates the lathy bainite matrix with low C and low Mn is more conducive to the refinement of parent austenite, thus leading to fine and dispersive TM/A. During tensile deformation, the fine and dispersive lath-structures can effectively alleviate strain localization on the interfaces which resulted from the deformability difference between the soft and hard phases, thereby delaying crack initiation and propagation. After RT-Q&P treatment, the outstanding mechanical properties with UTS of 1152 MPa, TEL of 32.6 %, YS of 754 MPa, and PSE of 37.6 GPa·% was achieved in sample with lathy bainite matrix, far exceeding the properties of traditional Q&P steels, which was mainly attributed to higher work-hardening ability of fine and dispersive structure and sustained TRIP effect of RA.

在这项工作中，通过冷轧和预处理，有意设计了不同的初始微观结构，包括变形冷轧结构、淬火马氏体、粒状贝氏体和片状贝氏体。同时，还提出了一种新的室温淬火和分割（RT-Q&P）工艺，以进一步提高铜镍轴承 Q&P 的强度-电导率组合。本研究旨在探讨经室温淬火和分割工艺处理的 Q&P 钢中初始微观组织对奥氏体形成动力学、RA 力学稳定性、微观组织演变和力学性能的影响。与未经预处理的样品相比，经过预处理的样品由于在马氏体/贝氏体基体上有更多的成核点，奥氏体化程度更高。DICTRA 模拟表明，低 C 和低 Mn 的贝氏体基体更有利于母体奥氏体的细化，从而导致细小而分散的 TM/A。在拉伸变形过程中，细小而分散的莱氏体结构可有效缓解因软硬相间的变形性差异而导致的界面上的应变局部化，从而延迟裂纹的产生和扩展。经过 RT-Q&P 处理后，具有贝氏体基体的样品获得了优异的力学性能，其 UTS 为 1152 MPa，TEL 为 32.6 %，YS 为 754 MPa，PSE 为 37.6 GPa-%，远远超过了传统 Q&P 钢的性能，这主要归功于精细分散结构更高的加工硬化能力和 RA 的持续 TRIP 效应。

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引用次数: 0

Regulating hardness homogeneity and corrosion resistance of Al-Zn-Mg-Cu alloy via ECAP combined with inter-pass aging 通过 ECAP 与层间时效相结合调节铝锌镁铜合金的硬度均匀性和耐腐蚀性能

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-26 DOI: 10.1016/j.matchar.2024.114489

Jian Li , Tao He , Xiang-yang Du , Alexey Vereschaka , Jun-jie Zhang

The novel processing strategies of Equal Channel Angular Pressing (ECAP) combined with inter-pass aging was designed, and XRD, SEM, TEM, electrochemical testing, and hardness testing were used to evaluate the relationship between microstructure and performance of alloys in this work. The results indicate that the hardness uniformity of the circular cross-section perpendicular to the extrusion direction was improved by combining ECAP with inter-pass aging, resulting in a hardness inhomogeneity factor (∼0.030) that was lower than that achieved by peak aging and double-stage aging alloys. Polarization curves and electrochemical impedance spectra show that a more negative corrosion potential and a smaller corrosion current density were possessed by the alloy, with the maximum intergranular corrosion depth (IGC) being reduced to 38 μm. Microstructure observation indicates that the improvement in hardness uniformity is due to the uniformity of grain size and the improved distribution and size of the η’ phase, which is attributed to the interaction between the pinning and shear effects of precipitates and dislocations during deformation. The enhanced corrosion resistance was attributed to an orderly combination of deformation and aging that increases the grain boundary volume and disrupts the η phase continuity within grain boundaries.

本研究设计了等通道角压（ECAP）与层间时效相结合的新型加工策略，并采用 XRD、SEM、TEM、电化学测试和硬度测试来评估合金的微观结构与性能之间的关系。结果表明，通过将 ECAP 与层间时效相结合，垂直于挤压方向的圆形截面的硬度均匀性得到了改善，使硬度不均匀系数（∼0.030）低于峰值时效和双阶段时效合金所达到的硬度不均匀系数。极化曲线和电化学阻抗谱显示，合金具有更负的腐蚀电位和更小的腐蚀电流密度，最大晶间腐蚀深度（IGC）减小到 38 μm。显微结构观察表明，硬度均匀性的改善是由于晶粒尺寸的均匀性和η'相分布和尺寸的改善，而η'相的改善是由于变形过程中析出物和位错的针刺效应和剪切效应之间的相互作用。抗腐蚀性的增强归因于变形和老化的有序结合，这种结合增加了晶界体积，破坏了晶界内 η 相的连续性。

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引用次数: 0

Analysis of thin-wall effect mechanism based on stress rupture properties and fracture characteristics of DD10 Ni-based single-crystal alloy 基于 DD10 镍基单晶合金应力断裂特性和断裂特征的薄壁效应机理分析

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-26 DOI: 10.1016/j.matchar.2024.114494

Jiawan Chen , Tieshan Cao , Wei Xu , Jiahui Wu , Yebing Hu , Lamei Cao , Yue Zhang , Congqian Cheng , Jie Zhao

The stress rupture life and fracture characteristics of DD10 nickel-based single crystal alloy with different wall thicknesses were investigated. Stress rupture tests were performed on samples with wall thicknesses of 0.8 mm and 0.5 mm at 1000 °C/200 MPa and 1150 °C / 100 MPa. According to the experimental results, the thin wall effect was observed at both 1000 °C / 200 MPa and 1150 °C / 100 MPa. XRM (X-ray microscope) results show a larger proportion of large size cracks/voids in the 0.8 mm wall samples than in the 0.5 mm wall samples. Meanwhile, the C* values are smaller in the thicker wall samples than in the thinner wall samples for the same crack length. Combining the results of XRM and C* results speculate that a longer crack length and propagation time is required to achieve unstable propagation in thicker walled samples. This is one of the important reasons for the thin-wall effect.

研究了不同壁厚的 DD10 镍基单晶合金的应力断裂寿命和断裂特性。在 1000 °C/200 MPa 和 1150 °C/100 MPa 条件下，对壁厚分别为 0.8 mm 和 0.5 mm 的样品进行了应力断裂测试。实验结果表明，薄壁效应在 1000 °C / 200 MPa 和 1150 °C / 100 MPa 时均可观察到。XRM（X 射线显微镜）结果显示，与 0.5 毫米壁的样品相比，0.8 毫米壁的样品中大尺寸裂纹/空洞的比例更大。同时，在相同的裂缝长度下，壁厚较厚的样品的 C* 值小于壁薄的样品。结合 XRM 和 C* 的结果推测，在壁较厚的样品中，需要更长的裂纹长度和扩展时间才能实现不稳定扩展。这是产生薄壁效应的重要原因之一。

引用次数: 0

Microstructural evolution and cyclic oxidation behavior of HVOF-sprayed NiCrSi and NiCrC coatings on T11 steel T11 钢上 HVOF 喷涂的 NiCrSi 和 NiCrC 涂层的微观结构演变和循环氧化行为

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-26 DOI: 10.1016/j.matchar.2024.114495

Subbarao Medabalimi , Ajit M. Hebbale , Richa Singh , Vijay Desai , M.R. Ramesh

This study analyzes NiCrSi and NiCrC coatings developed on low alloy ferritic stainless steel (grade T11) through the HVOF spraying technique. The coatings were characterized by their phase constitution, microstructure, cyclic oxidation behavior, and hardness. X-ray diffraction (XRD) analysis confirmed the presence of the NiCr solid solution matrix as the primary phase in both coatings. Moreover, the microstructure of the NiCrSi coating included the hard intermetallic compounds like Cr₃Si and Ni₃Si and the NiCrC coating contained the hard phases like Cr₃C₂ and Ni₃C which improved the hardness and the wear resistance of the coatings. Microhardness measurements revealed that the coatings had an average hardness of 300 ± 50 HV, significantly greater than the substrate hardness of 225 ± 25 HV. Cyclic oxidation tests were carried out at 700 °C revealed that both the coatings showed a lower weight gain than the uncoated substrate, suggesting enhanced oxidation resistance. This was because the protective oxide layers like Cr₂O₃ and SiO₂ in the NiCrSi coating and Cr₂O₃ and NiO in the NiCrC coating were formed. X-ray analysis establish ed. the presence of these oxides, which inhibited oxygen penetration through the coatings and provided additional protection against oxidation. Therefore, the study revealed that both NiCrSi and NiCrC coatings have good mechanical and oxidation resistance properties, which make them suitable for high-temperature applications where there is a need for improved durability, wear resistance, and protection against oxidation.

本研究分析了通过 HVOF 喷涂技术在低合金铁素体不锈钢（T11 级）上形成的 NiCrSi 和 NiCrC 涂层。涂层的特征包括相组成、微观结构、循环氧化行为和硬度。X 射线衍射（XRD）分析证实，两种涂层的主相都是镍铬固溶体基体。此外，NiCrSi 涂层的微观结构中含有铬₃Si 和镍₃Si 等硬金属间化合物，而 NiCrC 涂层则含有铬₃C₂和镍₃C 等硬相位，从而提高了涂层的硬度和耐磨性。显微硬度测量显示，涂层的平均硬度为 300 ± 50 HV，明显高于基体硬度 225 ± 25 HV。在 700 °C 下进行的循环氧化测试表明，两种涂层的增重都低于未涂层的基底，这表明涂层的抗氧化性得到了增强。这是因为在 NiCrSi 涂层中形成了 Cr₂O₃ 和 SiO₂ 等保护性氧化层，在 NiCrC 涂层中形成了 Cr₂O₃ 和 NiO。X 射线分析证实了这些氧化物的存在，它们抑制了氧气穿透涂层，并提供了额外的抗氧化保护。因此，研究表明 NiCrSi 和 NiCrC 涂层都具有良好的机械性能和抗氧化性能，适合于需要提高耐久性、耐磨性和抗氧化保护的高温应用。

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引用次数: 0

Microstructural and thermal relaxation of residual stress in dual peened TA15 titanium alloy fabricated by SLM 利用 SLM 制造的双层强化 TA15 钛合金中残余应力的微观结构和热松弛

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-26 DOI: 10.1016/j.matchar.2024.114496

Ang Yin , Wenliang Yu , Wenbo Li , Wenlong Zhu , Vincent Ji , Chuanhai Jiang , Chengxi Wang

TA15 (Ti-6Al-2Zr-1Mo-1 V) is a near-α titanium alloy widely used in aerospace applications due to its high specific strength and corrosion resistance. However, like other titanium alloys, TA15 faces significant manufacturing challenges. Selective Laser Melting (SLM), a high-precision additive manufacturing technique, enables the efficient production of complex components but also introduces issues such as tensile residual stress. This study investigates the effects of dual shot peening on the residual stress and microstructure of SLM-fabricated TA15 alloy, and analyzes the thermal relaxation behavior post-peening. The results indicate that shot peening induces a compressive residual stress (CRS) field near the material surface and significantly refines the grains in the deformed layer, resulting in the formation of nanocrystals. The introduction of low-intensity ceramic shots in dual shot peening effectively improves the surface quality and enhances CRS, although it has minimal impact on grain size and microstrain. Using the ZWA model, the activation energy for thermal relaxation of residual stress and microstrain was determined, revealing that their relaxation behavior is controlled by thermally activated diffusion of point defects, especially vacancies. Post-thermal exposure, extensive dislocation annihilation and grain growth were observed in the deformed layer, with recrystallized grain size increasing with annealing temperature and depth.

TA15（Ti-6Al-2Zr-1Mo-1 V）是一种接近α的钛合金，由于具有高比强度和耐腐蚀性，被广泛应用于航空航天领域。然而，与其他钛合金一样，TA15 也面临着巨大的制造挑战。选择性激光熔融（SLM）是一种高精度快速成型制造技术，可高效生产复杂部件，但也会带来拉伸残余应力等问题。本研究调查了双喷丸强化对 SLM 制造的 TA15 合金的残余应力和微观结构的影响，并分析了强化后的热松弛行为。结果表明，喷丸强化会在材料表面附近产生压缩残余应力（CRS）场，并显著细化变形层中的晶粒，从而形成纳米晶。在双喷丸强化过程中引入低强度陶瓷喷丸可有效改善表面质量并增强 CRS，但对晶粒大小和微应变的影响很小。利用 ZWA 模型确定了残余应力和微应变热松弛的活化能，发现它们的松弛行为是由点缺陷（尤其是空位）的热活化扩散控制的。热暴露后，在变形层中观察到广泛的位错湮灭和晶粒生长，再结晶晶粒大小随退火温度和深度的增加而增大。

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引用次数: 0

Microstructure and thermal stability of MgZnYAl alloy containing cluster-arranged nanoplates (CANaPs) 含有团簇排列纳米板（CANaPs）的 MgZnYAl 合金的微观结构和热稳定性

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2024-10-25 DOI: 10.1016/j.matchar.2024.114492

Andrea Farkas , Gergely Farkas , Patrik Dobroň , Jozef Veselý , Shin-ichi Inoue , Yoshihito Kawamura , Kristián Máthis , Daria Drozdenko

The thermal stability of the microstructure of Mg - 0.9 % Zn - 2.05 % Y - 0.15 % Al (at.%) alloy prepared by conventional extrusion (CE) from cast ingot and rapidly solidified (RS) ribbon consolidation method has been investigated by scanning and transmission electron microscopy. It is shown that in the initial state, although both microstructures consist of small recrystallized and large non-recrystallized grains, the distribution and morphology of the solute-enriched phases are strongly influenced by the processing route. Particularly, the RS alloy mainly contains fine homogeneously distributed cluster-arranged nanoplates (CANaPs), while the CE alloy is characterized by larger solute-enriched phases (incl. CANaPs and LPSO fractions) together with individual cluster-arranged layers (CALs) and/or thin CANaPs. Differences in the size and distribution of solute-enriched phases naturally affect the recrystallization dynamics during post-processing heat treatment. Nevertheless, both types of material exhibited exceptionally high thermal stability up to 300 °C, which significantly exceeds the values reported for conventional Mg alloy systems.

通过扫描和透射电子显微镜研究了从铸锭采用传统挤压（CE）法和快速凝固（RS）带状固结法制备的镁-0.9%锌-2.05%钇-0.15%铝（at.%）合金微观结构的热稳定性。结果表明，在初始状态下，虽然两种合金的微观结构都由小的再结晶晶粒和大的非再结晶晶粒组成，但溶质富集相的分布和形态受加工路线的影响很大。特别是，RS 合金主要包含细小均匀分布的团簇排列纳米板（CANaPs），而 CE 合金的特点是较大的溶质富集相（包括 CANaPs 和 LPSO 部分）以及单个团簇排列层（CALs）和/或薄 CANaPs。溶质富集相的大小和分布差异自然会影响后加工热处理期间的再结晶动力学。尽管如此，这两种材料在高达 300 °C 的温度下都表现出了极高的热稳定性，大大超过了传统镁合金体系的热稳定性值。

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