Effects of TiB2 Content and T6 Heat Treatment on Microstructure and Hardness of In-situ TiB2/ZL111 Composites
WANG Yingwu1,2, ZUO Xiaoqing1, RAN Songjiang1, KONG Dehao1
1 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093 2 Yunnan Provincial Academy of Science and Technology, Kunming 650000
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.
王应武, 左孝青, 冉松江, 孔德昊. TiB2含量及T6热处理对原位TiB2/ZL111复合材料显微组织和硬度的影响[J]. 材料导报, 2019, 33(8): 1371-1375.
WANG Yingwu, ZUO Xiaoqing, RAN Songjiang, KONG Dehao. Effects of TiB2 Content and T6 Heat Treatment on Microstructure and Hardness of In-situ TiB2/ZL111 Composites. Materials Reports, 2019, 33(8): 1371-1375.
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2019, Vol. 33 
