Pub Date : 2026-02-06DOI: 10.1016/j.ijplas.2026.104635
Wu-Rong Jian, Arjun S. Kulathuvayal, Hanfeng Zhai, Anshu Raj, Xiaohu Yao, Yanqing Su, Shuozhi Xu, Irene J. Beyerlein
{"title":"Atomistic and data-driven insights into the local slip resistances in random refractory multi-principal element alloys","authors":"Wu-Rong Jian, Arjun S. Kulathuvayal, Hanfeng Zhai, Anshu Raj, Xiaohu Yao, Yanqing Su, Shuozhi Xu, Irene J. Beyerlein","doi":"10.1016/j.ijplas.2026.104635","DOIUrl":"https://doi.org/10.1016/j.ijplas.2026.104635","url":null,"abstract":"","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"71 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Creep resistance is critical for the reliability of engineering structures at high temperatures. In this study, in situ scanning electron microscope (SEM) creep experiments show that laser powder bed fusion fabricated Ti-6Al-4V (LPBF Ti-6Al-4V) exhibits a creep lifetime about three to five times longer than that of forged Ti-6Al-4V. Distinct creep failure mechanisms were identified, with grain boundary sliding dominating in the forged Ti-6Al-4V, while void-induced grain boundary separation controlled the LPBF Ti-6Al-4V. By integrating experiments with a multiphysics coupled microscale creep model that simultaneously captures diffusion creep, dislocation glide and climb, grain boundary sliding, and void evolution, the results suggest that the elongated grain morphology and lower dislocation density in LPBF Ti-6Al-4V contribute to its enhanced creep performance. A physics-informed neural network (PINN)-driven multiscale creep framework is developed to bridge the gap between the mechanistic microscale creep model and macroscale creep life prediction. This work provides new insights into the creep resistance of additively manufactured titanium alloys and presents a promising approach for multiscale creep life assessment.
{"title":"Microstructural origins of enhanced creep resistance in laser printed Ti-6Al-4V","authors":"Zhun Liang , Mingyang Zhang , Zheng Guo , Zongchang Guo , Yinan Cui","doi":"10.1016/j.ijplas.2026.104637","DOIUrl":"10.1016/j.ijplas.2026.104637","url":null,"abstract":"<div><div>Creep resistance is critical for the reliability of engineering structures at high temperatures. In this study, <em>in situ</em> scanning electron microscope (SEM) creep experiments show that laser powder bed fusion fabricated Ti-6Al-4V (LPBF Ti-6Al-4V) exhibits a creep lifetime about three to five times longer than that of forged Ti-6Al-4V. Distinct creep failure mechanisms were identified, with grain boundary sliding dominating in the forged Ti-6Al-4V, while void-induced grain boundary separation controlled the LPBF Ti-6Al-4V. By integrating experiments with a multiphysics coupled microscale creep model that simultaneously captures diffusion creep, dislocation glide and climb, grain boundary sliding, and void evolution, the results suggest that the elongated grain morphology and lower dislocation density in LPBF Ti-6Al-4V contribute to its enhanced creep performance. A physics-informed neural network (PINN)-driven multiscale creep framework is developed to bridge the gap between the mechanistic microscale creep model and macroscale creep life prediction. This work provides new insights into the creep resistance of additively manufactured titanium alloys and presents a promising approach for multiscale creep life assessment.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"199 ","pages":"Article 104637"},"PeriodicalIF":12.8,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-05DOI: 10.1016/j.ijplas.2026.104634
Seonghwan Choi, Geonjin Shin, Jee Hyuk Ahn, Hyuk Jong Bong, Myoung-Gyu Lee, Kyung Mun Min
{"title":"From Taylor to Sachs: An Intermediate Constraint Based on a Single Microstructural Parameter","authors":"Seonghwan Choi, Geonjin Shin, Jee Hyuk Ahn, Hyuk Jong Bong, Myoung-Gyu Lee, Kyung Mun Min","doi":"10.1016/j.ijplas.2026.104634","DOIUrl":"https://doi.org/10.1016/j.ijplas.2026.104634","url":null,"abstract":"","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"307 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-03DOI: 10.1016/j.ijplas.2026.104632
Xian-Chen Kuang, Wu-Gui Jiang, Long-Hui Mao, Zhi-Kai Wu, Fen-Cheng Liu, Xiang Zhou, Peng-Hang Ling, Yang-Cheng Zhang, Min Yi
The fatigue performance of additively manufactured (AM) Inconel 718 is intrinsically governed by its grain morphology, necessitating a predictive understanding of the underlying plasticity-dominated mechanisms. To address this challenge, this study applies an integrated multilevel computational framework that explicitly bridges the process–structure–property–performance chain by coupling finite-element and cellular-automata (FE–CA) simulations of grain growth during laser powder bed fusion (LPBF), a deep neural network (DNN) for efficient material parameter calibration, and a strain-gradient crystal plasticity finite element (CPFE) model for fatigue life prediction. This unified framework enables, for the first time, a rigorous like-for-like comparison of three characteristic AM microstructures—equiaxed, columnar, and mixed grains—under a consistent computational and experimental calibration protocol, and thereby reveals new micromechanical insights into potential fatigue damage initiation from the plasticity perspective. Our simulations indicate that fatigue resistance is predominantly controlled by grain morphology and further modulated by morphology-induced anisotropy. Among them, equiaxed grains exhibit superior fatigue resistance to columnar and mixed grain morphologies, which is attributed to the activation of multiple slip systems and the resulting homogeneous deformation. In contrast, the strong texture in columnar grains gives rise to a pronounced “channeling effect”, leading to highly localized slip and a mismatch between regions of elevated plastic strain and actual damage accumulation. In terms of loading direction, the fatigue resistance under loading along the building direction (BD) is higher than that under loading along the transverse direction (TD). Crack initiation is predominantly predicted at high-angle grain boundaries and triple junctions, with the specific patterns highly sensitive to both grain morphology and loading direction. A key finding is the identification of a critical fatigue indicator parameter (FIP) threshold, beyond which fatigue life scatter intensifies significantly. While the CPFE model provides accurate predictions at intermediate strain amplitudes, its efficacy diminishes at higher strains due to the activation of alternative failure mechanisms. Overall, by integrating established computational methods, this work provides microstructure-sensitive insights and a practical framework for fatigue life prediction of AM materials, offering a potential pathway for AM process and microstructure optimization to achieve superior fatigue performance.
{"title":"Microstructure-Induced Fatigue Scatter of Additively Manufactured Inconel 718: Insight from Multilevel Simulations and Dislocation-based Strain Gradient Crystal Plasticity","authors":"Xian-Chen Kuang, Wu-Gui Jiang, Long-Hui Mao, Zhi-Kai Wu, Fen-Cheng Liu, Xiang Zhou, Peng-Hang Ling, Yang-Cheng Zhang, Min Yi","doi":"10.1016/j.ijplas.2026.104632","DOIUrl":"https://doi.org/10.1016/j.ijplas.2026.104632","url":null,"abstract":"The fatigue performance of additively manufactured (AM) Inconel 718 is intrinsically governed by its grain morphology, necessitating a predictive understanding of the underlying plasticity-dominated mechanisms. To address this challenge, this study applies an integrated multilevel computational framework that explicitly bridges the process–structure–property–performance chain by coupling finite-element and cellular-automata (FE–CA) simulations of grain growth during laser powder bed fusion (LPBF), a deep neural network (DNN) for efficient material parameter calibration, and a strain-gradient crystal plasticity finite element (CPFE) model for fatigue life prediction. This unified framework enables, for the first time, a rigorous like-for-like comparison of three characteristic AM microstructures—equiaxed, columnar, and mixed grains—under a consistent computational and experimental calibration protocol, and thereby reveals new micromechanical insights into potential fatigue damage initiation from the plasticity perspective. Our simulations indicate that fatigue resistance is predominantly controlled by grain morphology and further modulated by morphology-induced anisotropy. Among them, equiaxed grains exhibit superior fatigue resistance to columnar and mixed grain morphologies, which is attributed to the activation of multiple slip systems and the resulting homogeneous deformation. In contrast, the strong texture in columnar grains gives rise to a pronounced “channeling effect”, leading to highly localized slip and a mismatch between regions of elevated plastic strain and actual damage accumulation. In terms of loading direction, the fatigue resistance under loading along the building direction (BD) is higher than that under loading along the transverse direction (TD). Crack initiation is predominantly predicted at high-angle grain boundaries and triple junctions, with the specific patterns highly sensitive to both grain morphology and loading direction. A key finding is the identification of a critical fatigue indicator parameter (FIP) threshold, beyond which fatigue life scatter intensifies significantly. While the CPFE model provides accurate predictions at intermediate strain amplitudes, its efficacy diminishes at higher strains due to the activation of alternative failure mechanisms. Overall, by integrating established computational methods, this work provides microstructure-sensitive insights and a practical framework for fatigue life prediction of AM materials, offering a potential pathway for AM process and microstructure optimization to achieve superior fatigue performance.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"87 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146101602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-01-31DOI: 10.1016/j.ijplas.2026.104629
Lia Pribnow, Mika León Altmann, Thomas Wegener, Andree Irretier, Rainer Fechte-Heinen, Daniel Knoop, Anastasiya Tönjes
{"title":"Ultra-cryogenic and room temperature normalized impact toughness of laser additively manufactured Ti-6Al-4V and Ti-5Al-5Mo-5V-3Cr","authors":"Lia Pribnow, Mika León Altmann, Thomas Wegener, Andree Irretier, Rainer Fechte-Heinen, Daniel Knoop, Anastasiya Tönjes","doi":"10.1016/j.ijplas.2026.104629","DOIUrl":"https://doi.org/10.1016/j.ijplas.2026.104629","url":null,"abstract":"","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"92 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146095706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-01-31DOI: 10.1016/j.ijplas.2026.104628
Ji Lin, Wuyang Zhao, Rui Xiao
{"title":"A three-dimensional shear transformation zone theory for glassy polymers","authors":"Ji Lin, Wuyang Zhao, Rui Xiao","doi":"10.1016/j.ijplas.2026.104628","DOIUrl":"https://doi.org/10.1016/j.ijplas.2026.104628","url":null,"abstract":"","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"93 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146095707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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