首页|Effect of temperature on the mechanical properties of Ni-based superalloys via molecular dynamics and crystal plasticity

Effect of temperature on the mechanical properties of Ni-based superalloys via molecular dynamics and crystal plasticity

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Study on the influence of temperature on the mechanical properties across multiple scales has been a focus on the research of Hastelloy-X(HX)alloys for the application in high-temperature structure com-ponents.In this work,Molecular Dynamics(MD)and Crystal Plasticity(CP)are put together to solve it from atomic scale to mesoscopic scale.MD research indicates that the deformation of HX alloy occurs in two stages at temperature below 300 K:initially,as stacking fault deforms,stacking fault can trans-form into twinning with increasing strain.When the temperature exceeds 300 K,deformation primarily forms a stacking fault.The twinning deformation path transforms from intrinsic stacking fault to extrin-sic stacking fault and then to twinning.A mesoscopic-scale CP model was developed using atomic-scale deformation mechanisms to bridge the gap between deformation mechanisms and experimental results.The CP results indicate a functional relationship between the strength of HX alloy and temperature.This relationship appears insensitive to crystal texture and grain shape.Incorporating grain morphology and texture into the model significantly impacts the strength response of calculating HX alloy.After the ten-sile deformation of HX alloy at 300 and 1173 K,the atomic scale deformation results characterized by transmission electron microscopy are aligned with the MD simulation results.The relationship between strength and temperature predicted by CP results has also been validated.A thorough investigation into the deformation behavior of HX alloys across different scales,employing MD and CP models,introduces a novel approach for predicting the mechanical properties of superalloys.

Molecular dynamicsTwinningSuperalloyHigh-temperature strengthCrystal plasticity

Y.-Z.Liu、Z.-L.Shi、Y.-B.Zhang、M.Qin、S.-P.Hu、X.-G.Song、W.Fu、B.-J.Lee

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State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China

State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066000,China

Department of Materials Science and Engineering,National University of Singapore,Singapore 117576,Singapore

Shandong Institute of Shipbuilding Technology,Weihai 264209,China

Department of Materials Science and Engineering,Pohang University of Science and Technology,Pohang 790784,Korea

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2024

10.1016/j.jmst.2024.02.085

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.203(36)