Simultaneously enhancing strength and ductility of LPBF Ti alloy via trace Y2O3 nanoparticle addition

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外文摘要：Laser powder bed fusion(LPBF)is a popular additive manufacturing(AM)technique to fabricate metal components.LPBF Ti alloys often exhibit high strength but poor ductility.In this study,we report that trace Y2O3 nanoparticles added to a pre-alloyed Ti-4Al-4V(Ti44)powder provides an excellent feedstock for LPBF.As-built Ti44-Y2O3 materials exhibited a strength-ductility combination that is slightly better than heat-treated LPBF Ti64.Some Y2O3 particles may have melted or decomposed during LPBF.From electron microscopy,the addition of Y2O3 refined α'martensite laths and weakened variant preference during β→α'transformation.Based on in situ synchrotron X-ray diffraction and elastic-viscoplastic self-consistent(EVPSC)modeling,<c+a>slip was more active in as-built Ti44-Y2O3 than in as-built Ti64 or Ti44.This work demonstrates that LPBF can be an excellent method to fabricate metal-nanoparticle composite materials.

外文关键词：

Titanium alloysAdditive manufacturingNanoparticlesDuctilitySynchrotron diffraction

作者：

Yinghang Liu、Zhe Song、Yi Guo、Gaoming Zhu、Yunhao Fan、Huamiao Wang、Wentao Yan、Xiaoqin Zeng、Leyun Wang

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作者单位：

National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,Shanghai 200240,China

Deutsches Elektronen-Synchrotron(DESY),Hamburg 22607,Germany

State Key Laboratory of Mechanical Systems and Vibration,Shanghai Jiao Tong University,Shanghai 200240,China

College of Design and Engineering,National University of Singapore,117575,Singapore

State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China

Zhangjiang Institute for Advanced Study,Shanghai Jiao Tong University,Shanghai 201203,China

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基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of China

项目编号：

2021YFB3702602U2032124

出版年：

2024

DOI：

10.1016/j.jmst.2024.01.011

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)：2024.191(24)