自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 6    June 2018

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Effect of ultrasonic field on microstructure and mechanical properties of as-cast 7085 aluminum alloy
ZOU Hao(邹浩)1, PAN Qing-lin(潘清林)1, 2, SHI Yun-jia(史运嘉)1, CHEN Jing(陈婧)1, XIANG Hao(向浩)1, LI Rui-shi(李瑞师)2, LI Hang(李航)2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Suntown Technology Group Co., Ltd, Changsha 410200, China

Abstract:The effect of an ultrasonic field on the microstructure and mechanical properties of 7085 aluminum alloy during solidification was investigated by optical microscopy, Vickers hardness test, tensile test, scanning electron microscopy (SEM) with energy dispersive X-ray spectrometry, and electron probe micro-analysis (EPMA). The results showed that the grains of aluminum alloy were significantly refined and secondary phases were dispersed and distributed uniformly at the grain boundaries, due to ultrasonic treatment (UST). By EPMA, it was observed that the distribution of the main elements Al, Zn, Mg and Cu was more homogeneous in alloys with UST, than in alloys without UST. The mechanical properties of the aluminum alloy also significantly improved. As demonstrated by the SEM fractography of the fractured faces of several castings, fracture of the unrefined specimens occurred in a brittle manner, whereas the cracks of the refined specimens showed quasi-cleavage fracture.

 

Key words: ultrasonic treatment; grain refinement; microstructure; secondary phases

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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