Effects of ultrasound assisted solidificaiton on the microstructure and mechanical properties of nano-sized TiB2/Al-4.5Cu composites

被引：13
作者：
Liu, Zhiwei [1 ]
Xie, Peipei [1 ]
Chen, Mi [1 ]
Zheng, Qiaoling [1 ]
Gao, Yimin [1 ]
Liu, Yanfei [2 ]
Kai, Xizhou [3 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, 28 Xianning West Rd, Xian 710049, Shaanxi, Peoples R China
[2] China Acad Launch Vehicle Technol, R&D Dept, Beijing 100048, Peoples R China
[3] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China
来源：
MATERIALIA | 2021年 / 15卷
基金：
中国国家自然科学基金;
关键词：
Ultrasound; Solidification; Composites; Mechanical properties; Strengthening;
D O I：
10.1016/j.mtla.2021.101024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ultrasound assisted solidification (UAS) was applied in the fabrication of nano-sized TiB2p/Al-4.5Cu composites with the aim of decreasing the aggregation of TiB2 particles at alpha-Al grain boundaries (GBs) and inducing more TiB2 particles to distribute within grains. Experimental results showed that UAS could remarkably refine microstructure of Al-4.5Cu matrix and induced more TiB2 particles to distribute within alpha-Al grains, leading to the further improvement in both strength and ductility of composites. This research indicated that ultrasound was able to promote the nucleation of alpha-Al on more TiB2 particles and made TiB2 particles more susceptible to engulfment by moving solid/liquid interface during the solidification. Curve regression fitting method was conducted based on the strengthening model considering yield strength of composites, by which it was found that the ratio of TiB2 particles playing strengthening effects was increased from 0.035 to 0.06 with UAS treatment, indicating that the improvement in mechanical properties of composites treated with UAS was mainly attributed to the distribution of more nano-sized TiB2 particles within alpha-Al grains.
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页数：7
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