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. 13    No. 2    April 2003

[PDF Download]    [Flash Online]

    

Microstructure evolution during preparation of in-situ TiB reinforced titanium 
matrix composites
SHANG Jun-ling(尚俊玲), LI Bang-sheng(李邦盛), 
GUO Jing-jie(郭景杰), FU Heng-zhi(傅恒志)

School of Materials Science and Engineering, 
Harbin Institute of Technology, Harbin 150001, China

Abstract:By means of DTA, SHS quenching, XRD and SEM, the microstructure evolution during fabricating of TiB reinforced in-situ titanium matrix composite was studied. DTA result shows that there are two exothermic and one endothermic reaction during heating of Ti-B-Al system. The exothermic reactions correspond to the solid-solid diffusion reaction between Ti and Al, and the reaction of TiB formation respectively, and the endothermic reaction corresponds to melting of Al. The sample of SHS quenching presents four regions: unreacted region, heat-affected region, reacting region and product region. The microstructures of these regions reflect the process of microstructure evolution during preparation of in-situ TiB reinforced TMC. Ti, B, Al powders are in simple mechanical contact in the unreacted region; the sharp angles of original metal particles have become round and B diffuses into melted Al in the heat-affected region; TiB whiskers begin to appear and grow in the interior of reacting region. In product region, the TiB whiskers are uniform and fine. The result of XRD indicates that the reinforcements formed in product region are TiB whiskers. And the TiB is a hexagonal prism with a pyramidal head. 

 

Key words:  in-situ; titanium matrix composite; microstructure evolution

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