Microstructure evolution and strengthening mechanisms of a high-performance TiN-reinforced Al-Mn-Mg-Sc-Zr alloy processed by laser powder b e d fusion

被引：12
|
作者：
Tang, Hao [1 ]
Xi, Xiaoying [1 ]
Gao, Chaofeng [2 ]
Liu, Zhongqiang [1 ,3 ]
Zhang, Jiantao [1 ]
Zhang, Weiwen [1 ]
Xiao, Zhiyu [1 ]
Rao, Jeremy Heng [2 ]
机构：
[1] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Met Mat, Guangzhou 510641, Peoples R China
[2] Inst Adv Addit Mfg, Ji Hua Lab, Foshan 528000, Peoples R China
[3] Well Technol Co Ltd, Foshan 528225, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2024年 / 187卷
基金：
中国国家自然科学基金;
关键词：
Laser powder bed fusion; Aluminum matrix composites; Heterogeneous nucleation; Strengthening mechanisms; Mechanical performance; METAL-MATRIX COMPOSITES; PHASE SELECTION; ALUMINUM-ALLOY; ALSI10MG ALLOY; NANOCOMPOSITES; DEFORMATION; INOCULATION; FRACTURE; TEXTURE;
D O I：
10.1016/j.jmst.2023.11.033
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, a high-strength crack-free TiN/Al-Mn-Mg-Sc-Zr composite was fabricated by laser powder bed fusion (L-PBF). A large amount of uniformly distributed L12 -Al3 (Ti, Sc, Zr) nanoparticles were formed during the L-PBF process due to the partial melting and decomposition of TiN nanoparticles under a high temperature. These L12 -Al3 (Ti, Sc, Zr) nanoparticles exhibited a highly coherent lattice relationship with the Al matrix. All the prepared TiN/Al-Mn-Mg-Sc-Zr composite samples exhibit ultrafine grain microstructure. In addition, the as-built composite containing 1.5 wt% TiN shows an excellent tensile property with a yield strength of over 580 MPa and an elongation of over 8 %, which were much higher than those of wrought 7xxx alloys. The effects of various strengthening mechanisms were quantitatively estimated and the high strength of the alloy was mainly attributed to the refined microstructure, solid solution strengthening, and precipitation strengthening contributed by L12 -Al3 (Ti, Sc, Zr) nanoparticles. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：86 / 100
页数：15
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