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| Microstructure and mechanical properties of （ZrH2+TiH2）/Al-Cu-Mn alloy processed by selective laser melting |
| XU Xiaopeng 1，2，HUANG Weidong 1，2，QIN Shuaishuai 1，2，HUANG Xu 1，2，HE Dongdong 1，2，
WANG Lu 1，2 |
| （1. Fujian Key Laboratory of Intelligent Machining Technology and Equipment, Fuzhou 350118, China;
2.School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China） |
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Abstract To eliminate the thermal crack of Al-Cu alloy due to its wide solidification interval and improve its
mechanical strength. The ZrH2+TiH2/Al-Cu-Mn composite powder was prepared by mechanical mixing and used
for selective laser melting. The effects of ZrH2-TiH2 on the microstructure and mechanical properties of Al-Cu-
Mn alloy were studied by means of optical microscope, SEM, EDS, hardness tester and tensile test.The results
show that highest density is obtained when the laser energy density is 120 J/mm3. The addition of ZrH2-TiH2 into
the Al-Cu-Mn alloy effectively promoted the columnar-to-equiaxed transition and grain refinement, the hot cracks
are eliminated after ZrH2-TiH2 addition. Compared to the Al-Cu-Mn alloy, the ZrH2-TiH2 added alloy exhibits increased
properties: the microhardness increases by 16.5%, the ultimate strength reaches 356.5 MPa, and the elongation
is 8.8%. After solution treated at 540 ℃ for 1 h and aged at 185 ℃ for 10 h, the ultimate strength of the
sample is further increased to 460.9 MPa, and the elongation reaches 11.4%. The addition of ZrH2 and TiH2 can effectively eliminate the thermal crack in the forming process of Al-Cu alloy and improve the mechanical
properties of the alloy.
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Received: 27 June 2022
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Corresponding Authors:
黄卫东（1971－），男，教授，主要研究方向为增材制造技术、先进制造工艺与装备等。
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2023, Vol. 33 
