Making selective-laser-melted high-strength Al-Mg-Sc-Zr alloy tough via ultrafine and heterogeneous microstructure

被引：83
作者：
Wang, Zihong [1 ,2 ]
Lin, Xin [1 ,2 ]
Kang, Nan [1 ,2 ]
Wang, Yanfang [1 ,2 ]
Yu, Xiaobin [1 ,2 ]
Tan, Hua [1 ,2 ]
Yang, Haiou [1 ,2 ]
Huang, Weidong [1 ,2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, 127 Youyixilu Rd, Xian 710072, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Key Lab Met High Performance Addit Mfg & Innovat, MIIT China, 127 Youyixilu Rd, Xian 710072, Shaanxi, Peoples R China
来源：
SCRIPTA MATERIALIA | 2021年 / 203卷
基金：
中国国家自然科学基金;
关键词：
Additive manufacturing; Al-Mg-Sc-Zr alloys; Fracture toughness; Selective laser melting; Microstructure; MECHANICAL-PROPERTIES; METALLIC COMPONENTS; FRACTURE-TOUGHNESS; ALUMINUM; TRANSITION; BEHAVIOR;
D O I：
10.1016/j.scriptamat.2021.114052
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
For most safety-critical applications, the achievement of both high strength and high toughness is one of the key requirements for structural materials. However, strength and toughness are generally mutually exclusive. Here, we report a selective-laser-melted Al-Mg-Sc-Zr alloy with a good combination of strength and toughness, which is comparable to those of 7075-T651 high-strength wrought Al alloy. Despite the brittle crack associated with order-induced planar slip due to secondary Al-3(Sc,Zr) nano-precipitates, the fracture toughness was effectively improved via diverse intrinsic/extrinsic toughening mechanisms associated with its ultrafine and heterogeneous microstructure. The present work provides a potent strategy for fabricating high-strength and high-toughness Al-based alloys. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：7
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