Pub Date : 2024-10-30DOI: 10.1016/j.scriptamat.2024.116433
J.F. Xiao, C. Cayron, R.E. Logé
This study elucidates the evolution of martensite deformation via Interaction Work (IW). The IW is the mechanical work done by external loading, assisting deformation by competing with the energy barrier. This interplay establishes the maximum IW (IWmax) criterion for variant selection of different deformation modes. Considering multiple deformation modes (A, B, …), the deformation mode with is expected to be activated first due to a lower energy barrier when subjected to deformation, which hints the evolution of martensite microstructures with the increasing trajectory of IWmax of various deformation modes. We validated this hypothesis by examining reorientation and deformation twinning in monoclinic martensite (B19’) in NiTi, orthorhombic (α’’), hexagonal martensite (α’) in Ti-based alloys, and γ’ martensite in CuAlNi shape memory alloys, and by comparing the predictions with existing literature.
{"title":"The role of interaction work in martensite deformation","authors":"J.F. Xiao, C. Cayron, R.E. Logé","doi":"10.1016/j.scriptamat.2024.116433","DOIUrl":"10.1016/j.scriptamat.2024.116433","url":null,"abstract":"<div><div>This study elucidates the evolution of martensite deformation via Interaction Work (IW). The IW is the mechanical work done by external loading, assisting deformation by competing with the energy barrier. This interplay establishes the maximum IW (IW<sub>max</sub>) criterion for variant selection of different deformation modes. Considering multiple deformation modes (A, B, …), the deformation mode with <span><math><mrow><mi>m</mi><mi>i</mi><mi>n</mi><mo>{</mo><mrow><mi>I</mi><msubsup><mi>W</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow><mi>A</mi></msubsup><mo>,</mo><mspace></mspace><mi>I</mi><msubsup><mi>W</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow><mi>B</mi></msubsup><mo>,</mo><mo>…</mo></mrow><mo>}</mo></mrow></math></span> is expected to be activated first due to a lower energy barrier when subjected to deformation, which hints the evolution of martensite microstructures with the increasing trajectory of IW<sub>max</sub> of various deformation modes. We validated this hypothesis by examining reorientation and deformation twinning in monoclinic martensite (B19’) in NiTi, orthorhombic (<em>α</em>’’), hexagonal martensite (<em>α</em>’) in Ti-based alloys, and γ’ martensite in CuAlNi shape memory alloys, and by comparing the predictions with existing literature.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116433"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-30DOI: 10.1016/j.scriptamat.2024.116434
Tim Fischer , Mina Amiri , Joshua Kumpati , Peter Hedström , Annika Borgenstam
To exploit the full potential of advanced high-strength steels (AHSS), a more in-depth understanding of the complex micromechanical interaction of thin-film retained austenite (RA) and lath martensite is indispensable. Inspired by the medium-Mn steel microstructure, a three-dimensional micromechanical modeling approach is therefore proposed in the present work, embedding the thin RA films explicitly into the hierarchical lath martensite structure. This enables systematic studies of the effect of RA film thickness and volume fraction on the local stresses and strains as well as their partitioning within the microstructure. The investigations reveal that with shrinking RA volume fraction, both stress and especially strain heterogeneity in the thin-film RA intensifies. In the martensite blocks, stress and strain heterogeneity also intensifies, although stresses are generally more heterogeneously, and strains much more homogeneously, distributed than in RA. The results underline the key role of RA with thin-film morphology for further optimizing AHSS microstructures.
要充分挖掘先进高强度钢（AHSS）的潜力，就必须更深入地了解薄膜残余奥氏体（RA）和板条马氏体之间复杂的微观机械相互作用。因此，受中锰钢微观结构的启发，本研究提出了一种三维微观力学建模方法，将保留奥氏体薄膜明确嵌入分层马氏体结构中。这样就能系统地研究 RA 薄膜厚度和体积分数对局部应力和应变的影响，以及它们在微观结构中的分布情况。研究表明，随着 RA 体积分数的缩小，薄膜 RA 中的应力，尤其是应变异质性会增强。在马氏体块中，应力和应变的异质性也会增强，不过与 RA 相比，应力的异质性通常更大，而应变的均匀性则更高。这些结果凸显了具有薄膜形态的 RA 对于进一步优化 AHSS 微结构的关键作用。
{"title":"3D micromechanical interaction of thin-film retained austenite and lath martensite by computational plasticity","authors":"Tim Fischer , Mina Amiri , Joshua Kumpati , Peter Hedström , Annika Borgenstam","doi":"10.1016/j.scriptamat.2024.116434","DOIUrl":"10.1016/j.scriptamat.2024.116434","url":null,"abstract":"<div><div>To exploit the full potential of advanced high-strength steels (AHSS), a more in-depth understanding of the complex micromechanical interaction of thin-film retained austenite (RA) and lath martensite is indispensable. Inspired by the medium-Mn steel microstructure, a three-dimensional micromechanical modeling approach is therefore proposed in the present work, embedding the thin RA films explicitly into the hierarchical lath martensite structure. This enables systematic studies of the effect of RA film thickness and volume fraction on the local stresses and strains as well as their partitioning within the microstructure. The investigations reveal that with shrinking RA volume fraction, both stress and especially strain heterogeneity in the thin-film RA intensifies. In the martensite blocks, stress and strain heterogeneity also intensifies, although stresses are generally more heterogeneously, and strains much more homogeneously, distributed than in RA. The results underline the key role of RA with thin-film morphology for further optimizing AHSS microstructures.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116434"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-30DOI: 10.1016/j.scriptamat.2024.116435
Cancan Ding , Chengyuan Deng , Qinyi Guo , Zhipeng Liu , Ru Ge , Bin Hu , Shilei Li , Haiwen Luo
We developed a novel Si/Cr-alloyed martensitic press-hardening steel (PHS), which has ultimate tensile strength (UTS) of 2280 MPa and total elongation (TE) of 10.9 % after a short hot-forming process, far superior to the present 22MnB5 PHS. Such an unprecedented mechanical combination is primarily attributed to the sufficient retained austenite (RA) grains with evenly distributed mechanical stabilities, which is realized by dissolving nearly 50 % volume percentage of Mn/Cr-rich cementite particles during the short soaking with the guidance of the numerical simulations. As a result, some RA grains have the C/Mn/Cr-enriched cores and other have the cementite cores that are neighbored with high C/Mn/Cr concentrations and steep gradients. This leads to the great heterogeneity in the mechanical stabilities of RA grains in a wide range so that these RA grains are able to provide a continuous TRIP effect for sustainably enhanced work hardening during deformation.
我们开发了一种新型 Si/Cr 合金马氏体压淬钢 (PHS)，经过短期热成型工艺后，其极限抗拉强度 (UTS) 达 2280 兆帕，总伸长率 (TE) 达 10.9%，远远优于目前的 22MnB5 PHS。这种前所未有的机械性能组合主要归功于具有均匀分布机械稳定性的足够保留奥氏体（RA）晶粒，这是在数值模拟的指导下，通过在短时间浸泡过程中溶解近 50% 体积百分比的富锰/铬雪明碳酸盐颗粒而实现的。因此，一些 RA 晶粒具有富含 C/Mn/Cr 的核心，而另一些则具有与高 C/Mn/Cr 浓度和陡峭梯度相邻的雪明碳酸盐核心。这导致 RA 晶粒的机械稳定性在很大范围内存在很大的异质性，因此这些 RA 晶粒能够提供持续的 TRIP 效应，从而在变形过程中持续增强加工硬化。
{"title":"Superhigh strength and ductile press-hardening steel produced by shortened austenitization of microstructure containing Mn/Cr-rich cementite particles","authors":"Cancan Ding , Chengyuan Deng , Qinyi Guo , Zhipeng Liu , Ru Ge , Bin Hu , Shilei Li , Haiwen Luo","doi":"10.1016/j.scriptamat.2024.116435","DOIUrl":"10.1016/j.scriptamat.2024.116435","url":null,"abstract":"<div><div>We developed a novel Si/Cr-alloyed martensitic press-hardening steel (PHS), which has ultimate tensile strength (UTS) of 2280 MPa and total elongation (TE) of 10.9 % after a short hot-forming process, far superior to the present 22MnB5 PHS. Such an unprecedented mechanical combination is primarily attributed to the sufficient retained austenite (RA) grains with evenly distributed mechanical stabilities, which is realized by dissolving nearly 50 % volume percentage of Mn/Cr-rich cementite particles during the short soaking with the guidance of the numerical simulations. As a result, some RA grains have the C/Mn/Cr-enriched cores and other have the cementite cores that are neighbored with high C/Mn/Cr concentrations and steep gradients. This leads to the great heterogeneity in the mechanical stabilities of RA grains in a wide range so that these RA grains are able to provide a continuous TRIP effect for sustainably enhanced work hardening during deformation.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116435"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552875","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}
Pub Date : 2024-10-30DOI: 10.1016/j.scriptamat.2024.116437
Weijiang Zhao , Hang Wang , Quanfeng He , Hu Li , Li Wang , Bin Liu , Yong Liu , Yong Yang
In this study, a variety of Co-Ni-Ti-Zr alloys with various compositions were examined to identify potential single-phase B2 intermetallics. While classical theoretical models suggested that most compositions would present multiple phases or even amorphous phases, the equiatomic CoNiTiZr alloy revealed a stable single-phased B2 structure even under extended annealing at temperatures approaching its melting point. Notably, this alloy showcased desirable properties, such as a strong Elinvar effect and a high elastic strain limit. To aid in the design of B2 multi-principal elemental intermetallics (MPEIs), we proposed a pseudo-binary system model that counts for both chemical long-range order across two sublattices and random atom mixing within each sublattice. The outcome of this study is expected to accelerate the identification of valuable B2 MPEIs.
{"title":"Formation of single-phased B2 multi-principal element intermetallics: From experiments to modeling","authors":"Weijiang Zhao , Hang Wang , Quanfeng He , Hu Li , Li Wang , Bin Liu , Yong Liu , Yong Yang","doi":"10.1016/j.scriptamat.2024.116437","DOIUrl":"10.1016/j.scriptamat.2024.116437","url":null,"abstract":"<div><div>In this study, a variety of Co-Ni-Ti-Zr alloys with various compositions were examined to identify potential single-phase B2 intermetallics. While classical theoretical models suggested that most compositions would present multiple phases or even amorphous phases, the equiatomic CoNiTiZr alloy revealed a stable single-phased B2 structure even under extended annealing at temperatures approaching its melting point. Notably, this alloy showcased desirable properties, such as a strong Elinvar effect and a high elastic strain limit. To aid in the design of B2 multi-principal elemental intermetallics (MPEIs), we proposed a pseudo-binary system model that counts for both chemical long-range order across two sublattices and random atom mixing within each sublattice. The outcome of this study is expected to accelerate the identification of valuable B2 MPEIs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116437"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552873","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}
Pub Date : 2024-10-29DOI: 10.1016/j.scriptamat.2024.116426
T. Pramanik , Cho Sandar Htet , Alicia Manjón-Sanz , J. Liu , S. Ullah , J. Kong , C. Babori , A. Brézard-Oudot , L. Daniel , S.T. Misture , A. Pramanick
Materials with antipolar-polar transformation are attractive for their large functional responses. However, the antipolar state remains controversial in many materials. For example, recent studies on archetypical antiferroelectric (AFE) materials indicate an incomplete compensation of antiparallel dipoles, which prompted their alternative definition as ferrielectric. Here, we investigated the origin of the ferrielectric (FIE) state in a classical AFE material using X-ray and neutron total scattering. We show that the FIE state arises from 3-dimensional modulation of the cation-centric electric dipoles, which can be viewed as periodic arrangement of 180° twin boundaries with non-Ising characteristics.
具有反极性-极性转变的材料因其巨大的功能响应而极具吸引力。然而，许多材料的反极性状态仍存在争议。例如，最近对典型反铁电（AFE）材料的研究表明，反平行偶极子的补偿是不完全的，这促使它们被定义为铁电。在这里，我们利用 X 射线和中子全散射研究了经典 AFE 材料中铁电（FIE）态的起源。我们的研究表明，铁电体态产生于以阳离子为中心的电偶极子的三维调制，可将其视为具有非伊辛特性的 180° 双边界的周期性排列。
{"title":"An atomistic structural description of the ferrielectric polar phase involving non-coplanar cation displacements","authors":"T. Pramanik , Cho Sandar Htet , Alicia Manjón-Sanz , J. Liu , S. Ullah , J. Kong , C. Babori , A. Brézard-Oudot , L. Daniel , S.T. Misture , A. Pramanick","doi":"10.1016/j.scriptamat.2024.116426","DOIUrl":"10.1016/j.scriptamat.2024.116426","url":null,"abstract":"<div><div>Materials with antipolar-polar transformation are attractive for their large functional responses. However, the antipolar state remains controversial in many materials. For example, recent studies on archetypical antiferroelectric (AFE) materials indicate an incomplete compensation of antiparallel dipoles, which prompted their alternative definition as ferrielectric. Here, we investigated the origin of the ferrielectric (FIE) state in a classical AFE material using X-ray and neutron total scattering. We show that the FIE state arises from 3-dimensional modulation of the cation-centric electric dipoles, which can be viewed as periodic arrangement of 180° twin boundaries with non-Ising characteristics.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116426"},"PeriodicalIF":5.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.scriptamat.2024.116417
Haojie Zhang , Shuyi Zhu , Yanli Shi , Kailei Lu , Jianqi Qi , Tiecheng Lu
Defects induced by air annealing pose a serious challenge to simultaneously achieve high transparency and high Verdet constant in Tb-based ceramics. Herein, an efficient strategy of air annealing followed by vacuum re-annealing is introduced in response to the dilemma. For the illustrative example, after a sequence of annealing treatments, the in-line transmittance of Tb2Hf2O7 ceramics was elevated from 59.1 % to 71.2 % at ∼1440 nm, accompanied by significant increase in the Verdet constant (from -280 ± 3 rad·T−1·m−1 to -307 ± 4 rad·T−1·m−1 at 515 nm and -164 ± 2 rad·T−1·m−1 to -181 ± 3 rad·T−1·m−1 at 635 nm). This improvement was achieved through the elimination of defect clusters and antisite defects within the ceramic without introducing excess detrimental oxygen vacancies. The innovative strategy demonstrated here for Tb based ceramics to simultaneously enhance the optical transparency and Verdet constant may open up a path for developing high-performance MO materials for Faraday isolators.
{"title":"Simultaneously enhancing the optical transparency and Verdet constant of Tb-based magneto-optical ceramic via defect elimination","authors":"Haojie Zhang , Shuyi Zhu , Yanli Shi , Kailei Lu , Jianqi Qi , Tiecheng Lu","doi":"10.1016/j.scriptamat.2024.116417","DOIUrl":"10.1016/j.scriptamat.2024.116417","url":null,"abstract":"<div><div>Defects induced by air annealing pose a serious challenge to simultaneously achieve high transparency and high Verdet constant in Tb-based ceramics. Herein, an efficient strategy of air annealing followed by vacuum re-annealing is introduced in response to the dilemma. For the illustrative example, after a sequence of annealing treatments, the in-line transmittance of Tb<sub>2</sub>Hf<sub>2</sub>O<sub>7</sub> ceramics was elevated from 59.1 % to 71.2 % at ∼1440 nm, accompanied by significant increase in the Verdet constant (from -280 ± 3 rad·T<sup>−1</sup>·m<sup>−1</sup> to -307 ± 4 rad·T<sup>−1</sup>·m<sup>−1</sup> at 515 nm and -164 ± 2 rad·T<sup>−1</sup>·m<sup>−1</sup> to -181 ± 3 rad·T<sup>−1</sup>·m<sup>−1</sup> at 635 nm). This improvement was achieved through the elimination of defect clusters and antisite defects within the ceramic without introducing excess detrimental oxygen vacancies. The innovative strategy demonstrated here for Tb based ceramics to simultaneously enhance the optical transparency and Verdet constant may open up a path for developing high-performance MO materials for Faraday isolators.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116417"},"PeriodicalIF":5.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536310","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}
Pub Date : 2024-10-28DOI: 10.1016/j.scriptamat.2024.116419
Yu-Jie Jia, Wei-Zhong Han
Formation of a new phase usually follows a fixed orientation relationship with matrix in metallic materials, i.e., hydrides prefer to form on the basal plane in hexagonal zirconium (Zr) under thermal equilibrium conditions. Here, we identify that hydride precipitation within α-Zr in dual-phase Zr-2.5Nb deviates from the traditional manner, being governed by β-Zr. Two types of orientation relationships between γ-ZrH and β-Zr are identified, namely Kurdjumov-Sachs and Pitsch. The habit plane of hydrides consistently aligns with {112}β. Hydrides can cross various colony boundaries but are obstructed by the β-Zr grain boundary. The high solubility and the fast diffusion rate of hydrogen inside body-centered cubic β-Zr are the origin of the unique hydride phase transformation in dual-phase Zircaloy. Our findings may provide some new understanding for solid-state phase transformation in dual-phase materials.
{"title":"Beta phase controls hydride precipitation within alpha phase in dual-phase Zr-2.5Nb","authors":"Yu-Jie Jia, Wei-Zhong Han","doi":"10.1016/j.scriptamat.2024.116419","DOIUrl":"10.1016/j.scriptamat.2024.116419","url":null,"abstract":"<div><div>Formation of a new phase usually follows a fixed orientation relationship with matrix in metallic materials, i.e., hydrides prefer to form on the basal plane in hexagonal zirconium (Zr) under thermal equilibrium conditions. Here, we identify that hydride precipitation within α-Zr in dual-phase Zr-2.5Nb deviates from the traditional manner, being governed by β-Zr. Two types of orientation relationships between γ-ZrH and β-Zr are identified, namely Kurdjumov-Sachs and Pitsch. The habit plane of hydrides consistently aligns with {112}<sub>β</sub>. Hydrides can cross various colony boundaries but are obstructed by the β-Zr grain boundary. The high solubility and the fast diffusion rate of hydrogen inside body-centered cubic β-Zr are the origin of the unique hydride phase transformation in dual-phase Zircaloy. Our findings may provide some new understanding for solid-state phase transformation in dual-phase materials.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116419"},"PeriodicalIF":5.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536311","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}
Pub Date : 2024-10-28DOI: 10.1016/j.scriptamat.2024.116410
Qian Wang , Jianan Hu , Hanbo Weng , Tong Zhang , Lufeng Yang , Jie Chen , Sensen Huang , Min Qi , Yingjie Ma , Daokui Xu , Jiafeng Lei , Rui Yang
Hydrogen absorption can cause crystallographic changes in both α and β phase of Ti alloy. To understand them better, the hydrogen diffusion behavior in Ti-5Al-5Mo-2V-2Cr-2Sn-2Zr dual-phase Ti alloy is investigated based on multi-scale characterization. The hydrogen distribution change of electrochemical hydrogen charging sample during aging at room temperature is characterized by neutron imaging technique. The hydride decomposition and hydrogen induced cracking are observed by interrupted in-situ method. Besides, the spinodal decomposition structure is observed in β phase, which is widened by large lattice expansion due to hydrogen absorption. Finally, the interface of δ-hydride/α-Ti with the orientation relationship of is investigated. A new periodic structure formed by {} stacking faults is identified as intermediate state of hydride transformation.
{"title":"Hydrogen diffusion-induced crystallographic changes in α + β titanium alloy","authors":"Qian Wang , Jianan Hu , Hanbo Weng , Tong Zhang , Lufeng Yang , Jie Chen , Sensen Huang , Min Qi , Yingjie Ma , Daokui Xu , Jiafeng Lei , Rui Yang","doi":"10.1016/j.scriptamat.2024.116410","DOIUrl":"10.1016/j.scriptamat.2024.116410","url":null,"abstract":"<div><div>Hydrogen absorption can cause crystallographic changes in both α and β phase of Ti alloy. To understand them better, the hydrogen diffusion behavior in Ti-5Al-5Mo-2V-2Cr-2Sn-2Zr dual-phase Ti alloy is investigated based on multi-scale characterization. The hydrogen distribution change of electrochemical hydrogen charging sample during aging at room temperature is characterized by neutron imaging technique. The hydride decomposition and hydrogen induced cracking are observed by interrupted in-situ method. Besides, the spinodal decomposition structure is observed in β phase, which is widened by large lattice expansion due to hydrogen absorption. Finally, the interface of δ-hydride/α-Ti with the orientation relationship of <span><math><mrow><mo>{</mo><mn>0001</mn><mo>}</mo><mi>α</mi><mo>/</mo><mo>/</mo><mo>{</mo><mn>001</mn><mo>}</mo><mi>δ</mi></mrow></math></span> <span><math><mrow><mo><</mo><mn>1</mn><mover><mn>2</mn><mo>¯</mo></mover><mn>10</mn><mo>></mo><mi>α</mi><mo>/</mo><mo>/</mo><mo><</mo><mn>110</mn><mo>></mo><mi>δ</mi></mrow></math></span> is investigated. A new periodic structure formed by {<span><math><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>0</mn></mrow></math></span>} stacking faults is identified as intermediate state of hydride transformation.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116410"},"PeriodicalIF":5.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536308","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}
Pub Date : 2024-10-28DOI: 10.1016/j.scriptamat.2024.116413
Yusuke Ohashi, Hidemi Kato
A Ti/Mg composite with bicontinuous microstructure of α-Ti/α-Mg was fabricated using a Ti-Sc precursor's microstructure as a template. A Ti-Sc precursor alloy with α-Ti/α-Sc dual-phase microstructure was immersed in molten Mg, and using differences in chemical interactions between the alloy's components and the metallic melt, only α-Sc of the precursor was replaced by molten Mg. The Ti/Mg composite exhibited an ultimate tensile strength of 308.4 MPa and elongation of 6.8 % by a tensile test. The microstructure elongated in the tensile direction indicates that the α-Ti and α-Mg phases cooperatively deformed and contributed to ductility. The continuous microstructure in the tensile direction of the immiscible phases and the weak interface that does not separate because of geometric constraints may be the reason why the hardness properties of the composite follow the Voigt rule.
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Pub Date : 2024-10-22DOI: 10.1016/j.scriptamat.2024.116416
Kento Katagiri , Bernard Kozioziemski , Eric Folsom , Sebastian Göde , Yifan Wang , Karen Appel , Darshan Chalise , Philip K. Cook , Jon Eggert , Marylesa Howard , Sungwon Kim , Zuzana Konôpková , Mikako Makita , Motoaki Nakatsutsumi , Martin M. Nielsen , Alexander Pelka , Henning F. Poulsen , Thomas R. Preston , Tharun Reddy , Jan-Patrick Schwinkendorf , Leora E. Dresselhaus-Marais
Optimizing grain boundary characteristics in polycrystalline materials can improve their properties. Many processing methods have been developed for grain boundary manipulation, including the use of intense radiation in certain applications. In this work, we used X-ray free electron laser pulses to irradiate single-crystalline bismuth selenide (Bi2Se3) and observed grain boundary formation and subsequent grain rotation in response to the X-ray radiation. Our observations with simultaneous transmission X-ray microscopy and X-ray diffraction demonstrate how intense X-ray radiation can rapidly change size and texture of grains.
优化多晶材料的晶界特性可以改善其性能。目前已开发出许多用于晶界处理的加工方法，包括在某些应用中使用强辐射。在这项工作中，我们使用 X 射线自由电子激光脉冲辐照单晶硒化铋（Bi2Se3），并观察了晶界的形成以及随后晶粒在 X 射线辐射下的旋转。我们利用透射 X 射线显微镜和 X 射线衍射同时进行的观察表明，强烈的 X 射线辐射可以迅速改变晶粒的尺寸和纹理。
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