Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (2): 129-134,140.doi: 10.3969/j.issn.1000-565X.2013.02.021

• Materials Science & Technology • Previous Articles     Next Articles

Efect of Semisolid Rolling on Microstructure of Deposited 7050 Aluminum Alloyh

Li Feng-xian Liu Yun-zhong Li Zhi-long Du Liang   

  1. National Engineering Research Center of Near-Net-Shape Forming Technology for Metallic Materials,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2012-03-20 Revised:2012-11-17 Online:2013-02-25 Published:2013-01-05
  • Contact: 刘允中(1969-)，男，教授，博士生导师，主要从事喷射成形、粉末冶金研究 E-mail:yzhliu@scut.edu.com
  • About author:李凤仙(1983-)，女，博士生，主要从事材料加工研究．E．mail：175182344@qq.com
  • Supported by:

    国家自然科学基金资助项目(50774035)；华南理工大学中央高校基本科研业务费专项资金资助项目(2011ZZ0010)

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Abstract:

Semisolid rolling of spray-deposited 7050 aluminum alloy was carried out at 560～620 ℃,and the effects of remehing temperature on grain size and second-phase distribution of the alloy were investigated by means of SEM ,EDS and XRD.Moreover,the influences of remehing temperature and thickness reduction ratio on the mi-crostructureof the strips were explored,and the feasibility of semisolid rolling was evaluated.The results show that(1)the activation energy for the grain growth of spray-deposited 7050 aluminum alloy is 70.5 kJ/mol;(2)when the remehing temperature inereases from 560 to 620 ℃,the coarsening rate and the liquid fraction of spray-deposited 7050 aluminum a110y respectively increase from 1.16 to 76.06  μm3 /s and from 3.7% to 64.1% ;(3)the distribu。ti0n and amount 0f second-phase particles inhibit the coarsening of spray-deposited 7050 aluminum alloy; (4)the optimum remelting temperature for the semisolid rolling is 590℃ ;and(5)the rolling deformation plays its role in tenns of eliminating pores,breaking grains and accelerating dynamic reerystallization.

Key words: spray deposition, semisolid, rolling, mierostructur

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