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. 7    No. 1    March 1997

[PDF Download]    [Flash Online]

    

TiAl ALLOYS PREPARED BY THERMAL EXTRUSION OF ELEMENTAL POWDER MIXTURES
Liu Zhijian; Qu Xuanhui; Huang Baiyun

Powder Metallurgy Research Institute; Central South University of Technology; Changsha 410083

Abstract:α2+γ dual phase TiAl intermetallics had been synthesized with elemental powder mixtures at high temperature. The consolidated samples were prepared by thermal extrusion of steel canned TiAl compacts. The thermal extrusion was carried out at 1 200 ℃, with extrusion ratios of 4, 8 and 16. The study on microstructures and mechanical properties showed that with increasing extrusion ratio, the porosity of the compacts as well as grain size decreased, the bending strength increased. After heat treatment the bending strength of the specimens with the extrusion ratio of 16 could increase to 897 MPa. After the thermally extruded compact had been HIPped, though the density increased slightly, the bending strength decreased partly due to grain size coarsening.

 

Key words: powder metallurgy TiAl intermetallics thermal extrusion elemental powders

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