Effects of TiC nanoparticle inoculation on the hot-tearing cracks and grain refinement of additively-manufactured AA2024 Al alloys

被引:43
作者
Fan, Zhaojin [1 ,2 ]
Li, Chun [1 ]
Yang, Hailin [3 ]
Liu, Zhilin [2 ]
机构
[1] Nanchang Hangkong Univ, Natl Def Key Discipline Lab Light Alloy Proc Sci &, Nanchang 330063, Peoples R China
[2] Cent South Univ, Light Alloy Res Inst, Coll Mech & Elect Engn, Changsha 410083, Peoples R China
[3] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 19卷
基金
中国国家自然科学基金;
关键词
Additively-manufactured Al alloy; TiC nanoparticles; Crack inhibition; E2EM model; Grain refinement; MECHANICAL-PROPERTIES; EQUIAXED TRANSITION; ALUMINUM-ALLOYS; HEAT-TREATMENT; MICROSTRUCTURE; BEHAVIOR; FORMABILITY; COLUMNAR;
D O I
10.1016/j.jmrt.2022.05.039
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The hot-tearing cracks and porosities of Al alloys usually developed in the selective laser melting (SLM) additive manufacturing, impairing the corresponding mechanical properties and machining performance. Thus, it is necessary to eliminate these defects via grain refinement of microstructures. In the present work, the SLMed TiC/AA2024 Al alloy was obtained by adding different contents of TiC nanoparticles into the AA2024 Al alloy powder at different laser scanning speeds. Experimental results show that the addition of TiC nanoparticles significantly refined the microstructures of SLMed AA2024 Al alloy matrix. Coarsening columnar grains were gradually transitioned to small equiaxed grains, which suppresses the formation and propagation of cracking and porosities. Such phenomenon was mainly attributed to the significant grain refinement during SLM solidification. The externally added TiC nanoparticles and the in-situ formed Al3Ti particles have certain orientation relationship (ORs) with their surrounding metal matrix. These ORs are related to the nucleating interface with low lattice mismatch, which promotes grain refinement via heterogeneous nucleation. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码:194 / 207
页数:14
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