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]

    

High strain-rate tensile properties of a TiAl alloy in duplex and fully lamellar microsturctural forms
Wang Yu(王 瑜)1, Lin Dongliang( T. L. Lin)(林栋梁)1,Young-Won Kim2

1. Open Laboratory ofEducation Ministry of China for High-Temperature Materials and Tests,School of Materials Science and Engineering, ShanghaiJiao Tong University,Shanghai200030,P. R. China;
2. UES, Dayton, Ohio45432, USA

Abstract:A self-designed Split-Hopkinson tensile bar setup with a rotating disk was used to investigate roomtemperature tensile properties of aγ-TiAl alloy in duplex (DP) and fully lamellar (FL) microstructural forms under the dynamic strain rates between 70 and 800s-1. It was found that for both forms the alloy is brittle at these strain rates, exhibiting near-zero ductility. The σb at dynamic strain rate is greater than that at the static strain rate of 5×10-1s-1, and the σb of the DP material is higher than that of the FL material. Fractography analysis indicated that both materials at dynamic strain rates fracture in a mixed mode of predominant transgranular cleavage and minor intergranular cracking, which is similar to that at the static strain rate. The roomtemperature brittleness of the alloy is not environmentally related.

 

Key words: titanium aluminide; tensile property; high strain rate

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