首页|Microstructure evolution and strengthening mechanisms of a high-performance TiN-reinforced Al-Mn-Mg-Sc-Zr alloy processed by laser powder bed fusion

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

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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 mi-crostructure.In addition,the as-built composite containing 1.5 wt％TiN shows an excellent tensile prop-erty 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.

Laser powder bed fusionAluminum matrix compositesHeterogeneous nucleationStrengthening mechanismsMechanical performance

Hao Tang、Xiaoying Xi、Chaofeng Gao、Zhongqiang Liu、Jiantao Zhang、Weiwen Zhang、Zhiyu Xiao、Jeremy Heng Rao

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National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510641,China

Institute of Advanced Additive Manufacturing,Ji Hua Laboratory,Foshan 528000,China

Well Technology Company Limited,Foshan 528225,China

National Natural Science Foundation of ChinaGuangdong Basic Applied Basic Research Foundation,ChinaGuangdong Basic Applied Basic Research Foundation,ChinaGuangdong Basic Applied Basic Research Foundation,ChinaNatural Science Foundation Project of Guangzhou,China

522743632022A15150105582022A15150115972022A1515240065202201010526

2024

10.1016/j.jmst.2023.11.033

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.187(20)
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