TiB<sub>2</sub>含量及T6热处理对原位TiB<sub>2</sub>/ZL111复合材料显微组织和硬度的影响

doi:10.11896/cldb.17120010

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Abstract TiB₂/ZL111 composites were prepared by in-situ synthesis method, and their microstructure and hardness in both as-cast and T6 heat treatment states were systematically investigated. The results of microstructure observation show that the phase components of the as-cast TiB₂/ZL111 composites are mainly composed of α-Al, eutectic Si and TiB₂. The TiB₂ particles are hexagonal or oval in shape, with an average crystalline grain size less than 1 μm, and distribute at the boundary of α-Al grains. The addition of TiB₂ can effectively refine the α-Al grains in ZL111 alloy, and change the morphology of eutectic Si form elongated shape to equiaxed shape. T6 heat treatment can further promote the morphological transformation of eutectic Si from equiaxed shape into subglobose shape, and effectively improve the TiB₂ agglomeration phenomenon. The results of hardness measurement show that the higher the TiB₂ content, the higher the hardness of the TiB₂/ZL111 composites in the as-cast state. The hardness of 10wt% TiB₂/ZL111 composites (120.13Hv) rises by 24.32%, compared with the hardness of as-cast ZL111 alloy (96.63 Hv). The hardness of ZL111 alloy and TiB₂/ZL111 composites can be further improved by taking T6 heat treatment. However, the increase rate of hardness decreases with the increasing of TiB₂ content. This is attributed to the fact that TiB₂ inhibit the precipitation of Al₂Cu during aging process that can result in reducing the aging hardening effect of T6 heat treatment.

Key words： TiB₂/ZL111 composite in-situ T6 heat treatment microstructure hardness

Published: 28 April 2019

CLC number:

TB331

Fund:This work was financially supported by the National Natural Science Foundation of China (51164019, 51741103, 51861020) and the Science and Technology Plan Project of Yunnan Province (2018ZE018, 2018BA072).

About author:: Yingwu Wang, doctoral student, senior engineer, received his M.S. degree in June 2011 from Kunming University of Science and Technology. From September 2013 to the present, he learned at Kunming University of Science and Technology for his doctorate, focusing on the research of aluminum matrix composite and aluminum foam.; Xiaoqing Zuo, Kunming University of Science and Technology, professor, Ph.D., doctoral tutor, chief professor of foam metal materials innovation team of KMUST. His research interests are porous metal materials and metal matrix composite materials. He published 112 papers, including more than 40 articles in SCI and EI, authorized more than 30 national invention patents.

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	WANG Yingwu
	ZUO Xiaoqing
	RAN Songjiang
	KONG Dehao

Cite this article:

WANG Yingwu,ZUO Xiaoqing,RAN Songjiang, et al. Effects of TiB₂ Content and T6 Heat Treatment on Microstructure and Hardness of In-situ TiB₂/ZL111 Composites[J]. Materials Reports, 2019, 33(8): 1371-1375.

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http://www.mater-rep.com/EN/10.11896/cldb.17120010 OR http://www.mater-rep.com/EN/Y2019/V33/I8/1371

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