您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 3    September 1999

[PDF Download]    [Flash Online]

    

Structural evolution of non-dendritic AlSi7Mg alloy during reheating
Zhang Kui(张 奎), Zhang Yongzhong(张永忠), Liu Guojun(刘国均), Xu Jun(徐 骏),Zhang Jingxin(张景新), Fan Jianzhong(樊建中), Shi Likai(石力开)

General Research Institute for Nonferrous Metals, Beijing100088, P.R.China

Abstract:The structural evolution of non-dendritic AlSi7Mg alloy during reheating in resistance furnace was studied. The alloy ingots were produced by electromagnetic stirring during solidification. It was found that, the Si phase in eutectic dissolves in a way of diffusion towardαphase, its appearance changes from flake to dot-like, and tends to be fine and spheroidal with increasing reheating temperature. The thinner the flake, the lower the temperature for the occurrence of this process, and the higher the transforming speed. The eutectic melts partially when Si phase dissolves to some extent, and the morphology and size of primaryαphase begin to change. The dendrite and rosetteαphases tends to sphericize. The size of the former becomes larger, while the size of the latter reduces to be 1/2~1/4 of the original size. The spheroidal primaryαphase has a tendency of grain growth.

 

Key words: aluminum alloys; reheating; non-dentritic structure; transformation

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn