Microstructural origin of high strength and high strain hardening capability of a laser powder bed fused AlSi10Mg alloy

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外文摘要：Compared to a cast AlSi10Mg alloy,a laser powder bed fused(LPBF)AlSi10Mg alloy shows superior yield strength and strain hardening capability.However,the underlying microstructure origin has not been comprehensively understood.In this work,the microstructural evolution of an LPBF AlSi10Mg alloy dur-ing tensile deformation was investigated.Synchrotron X-ray diffraction characterization shows that both stress and strain exhibit significant partition between an Al phase and a Si phase upon tensile deforma-tion.This leads to a significant strain gradient between those two phases,which is evident by the high density of dislocations in the cell boundaries of the deformed alloy.The strain gradient results in long-range internal stress,also known as back stress,in the cell boundaries,and in turn leads to enhanced strength and strain hardening in the LPBF AlSi10Mg alloy.Quantitatively analyses via loading-unloading-reloading tests show that during the tensile deformation,the back stress contributes 135 MPa to the yield strength of the alloy,which continuously increases with increasing the strain beyond the yielding point.This work illuminates the microstructural origin of the back stress in the LPBF AlSi10Mg alloy,i.e.the back stress arises from the stress/strain partition between the Al and Si phases in the cellular structures,and the back stress leads to significant strengthening of the alloy upon tensile deformation.This work may also provide guidance for manipulating the mechanical properties of additively manufactured Al-Si alloys for specific application needs.

外文关键词：

AlSi10Mg alloyLaser powder bed fusionStrengthening mechanismPlastic deformation

作者：

C.Li、W.X.Zhang、H.O.Yang、J.Wan、X.X.Huang、Y.Z.Chen

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作者单位：

State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China

Chongqing University,Chongqing 400044,China

Ningbo Institute of Northwestern Polytechnical University,Ningbo 315103,China

Suzhou Yunjing Metal Tech.Ltd.,Suzhou 215024,China

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基金：

National Key Research and Development ProgramNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaQinchuangyuan"Scientist+Engineer"Team Development of Shaanxi ProvinceAdvanced Development of Aluminum Alloy Filler Materials used in welded Highend Lightweight Constructions-Research&Industrial

项目编号：

2022YFB3404203520712625210104952301197522340092022KXJ-0202022Z109

出版年：

2024

DOI：

10.1016/j.jmst.2024.01.067

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)：2024.197(30)