Inoculation treatment of an additively manufactured 2024 aluminium alloy with titanium nanoparticles

被引：342

作者：

Tan, Qiyang ^{[1
]}

Zhang, Jingqi ^{[1
]}

Sun, Qiang ^{[1
]}

Fan, Zhiqi ^{[1
]}

Li, Gan ^{[1
,2
]}

Yin, Yu ^{[1
]}

Liu, Yingang ^{[1
]}

Zhang, Ming-Xing ^{[1
]}

机构：

[1] Univ Queensland, Sch Mech & Min Engn, St Lucia, Qld 4072, Australia

[2] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Guangdong, Peoples R China

来源：

ACTA MATERIALIA | 2020年 / 196卷

关键词：

Selective laser melting; 2024 aluminium alloys; Grain refinement; EBSD; TEM; HIGH-ENTROPY ALLOY; CU-MG ALLOYS; GRAIN-REFINEMENT; MECHANICAL-PROPERTIES; HEAT-TREATMENT; ALSI10MG ALLOY; ORIENTATION RELATIONSHIPS; INTERMETALLIC PHASES; ZR CONTENT; AL;

D O I：

10.1016/j.actamat.2020.06.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Considerable studies on metal selective laser melting (SLM) have proved the necessity to refine microstructure parts fabricated by SLM in order to eliminate property anisotropy, hot-tearing and to increase the SLM-processability. In the present work, Ti nanoparticles, at the first time, were discovered to be an extremely effective inoculant for an SLMed 2024 aluminium alloy. 0.7 wt% addition of Ti nanoparticles was capable of substantially eliminating the hot-tearing cracks and columnar structure, and refining the grains in the SLMed 2024 alloy in a broad processing window. The substantial grain refinement in the Ti-inoculated 2024 alloy was attributed to the in-situ formation of Al3Ti nanoparticles with a L1(2) ordered structure, which formed a coherent interface with Al matrix and therefore significantly promoted the heterogeneous nucleation of the alpha-Al during solidification of melt pools in the SLM process. After a conventional T6 heat treatment, this SLMed alloy exhibited a superior balance of strength and ductility (tensile strength was up to 432 +/- 20 MPa and elongation of 10 +/- 0.8%), which was comparable to its wrought counterpart. This work can be considered as a breakthrough in research of fabricating high-strength aluminium alloys using SLM. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1 / 16

页数：16

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