The role of TiB2 in strengthening TiB2 reinforced aluminium casting composites

4th International Conference on Advances in Solidification Processes

材料科学;物理学

Chen, Z.^1 ; Kang, H.^1 ; Zhao, Y.^1 ; Zheng, Y.^1 ; Wang, T.^1

School of Materials Science and Engineering, Dalian University of Technology, No.2 Linggong Road, Ganjingzi District, Dalian City, China^1

关键词: Aluminium foundry alloys;    Aluminium matrix composites;    Direct synthesis method;    Foundry alloys;    Grain refinement effects;    Material strength;    Particle agglomerations;    Strengthening mechanisms;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/117/1/012039/pdf
DOI  :  10.1088/1757-899X/117/1/012039

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

With an aim of developing high quality in situ TiB2reinforced aluminium foundry alloy based composites, the conventional direct synthesis method was modified into a two-step route. In step one we optimized the halide salt route to fabricate in situ TiB2particulate reinforced aluminium matrix composites and in step two we investigated the effects of the Al-5wt.% TiB2composite, as a "master composite", on strengthening the practical foundry alloys. The in situ formed TiB2particles play two roles while strengthening the composites: (1) The grain refinement effect that improves the quality of the alloy matrix; and (2) The interactions between the hard particulates and the matrix add extra increment to the material strength. In different alloy systems, TiB2may play distinct roles in these two aspects (figure 1). Further analysis of the strengthening mechanisms shows that particle agglomeration behaviour during solidification is responsible for the latter one. The present work details the role of TiB2in strengthening TiB2reinforced aluminium casting composites.