In situ design of ultrafine-grained 7075 Al alloy with laser powder bed fusion

被引：4
作者：
He, Xi [1 ,2 ,3 ]
Li, Gan [1 ,2 ,4 ]
Huang, Yuhe [1 ,2 ,5 ]
Huang, Zhun [1 ]
Wang, Tao [3 ]
Li, Xinggang [1 ,2 ]
Zhu, Qiang [1 ,2 ]
机构：
[1] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
[2] Southern Univ Sci & Technol, Shenzhen Key Lab Addit Mfg High performance Mat, Shenzhen 518055, Peoples R China
[3] Xiangtan Univ, Sch Mech Engn & Mech, Xiangtan 411105, Peoples R China
[4] City Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
[5] Univ Sci & Technol Beijing, Inst Carbon Neutral, Beijing 100083, Peoples R China
来源：
MATERIALS LETTERS | 2023年 / 344卷
关键词：
Additive manufacturing; Laser powder bed fusion; Metals and alloys; 7075 Al alloy; Ti2AlNb intermetallic; Grain refinement;
D O I：
10.1016/j.matlet.2023.134401
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Laser powder bed fusion (L-PBF) is an advanced fast prototyping method for fabricating high-performance metallic components with complex structures. However, the development of L-PBFed high-strength Al alloys is often limited by the hot cracks. To grapple with this difficult issue, a novel solution was proposed by intro-ducing 3 wt% Ti2AlNb intermetallic (IMC) powders into the 7075 Al powders to form an in-situ nucleated 7075 (IN-7075) Al alloy. The results indicated that the as-printed IN-7075 Al alloy was crack-free, and the grain size has been refined from 72.6 mu m to 1.5 mu m, which was attributed to the in-situ formation of Al3(Ti, Nb) particles and the high grain growth restriction factor (Q) values of Ti and Nb elements in the Al matrix. After a suitable heat treatment, the IN-7075 Al alloy exhibited good mechanical properties with an ultimate tensile strength of 429 +/- 2 MPa and an elongation of 9.8 +/- 0.5%.
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页数：4
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