Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 10    October 2012

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Fracture characteristics of notched investment cast TiAl alloy through in situ SEM observation
CHEN Yan-fei1,2, ZHENG Shun-qi2, TU Jiang-ping1, XIAO Shu-long3, TIAN Jing3, XU Li-juan3, CHEN Yu-yong3

1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
2. Ningbo Sub-academy of the National Weapons Science Research Academy, Ningbo 315103, China;
3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:TiAl alloys were produced by investment casting method combined with induction skull melting (ISM) technique. In situ scanning electron microscopy (SEM) was utilized to study the fracture characteristics and crack propagation of a notched investment cast TiAl specimens in tension under incremental loading conditions. The whole process of crack initiation, propagation and failure during tensile deformation was observed and characterized. The results show that the fracture mechanism was sensitive to not only the microcracks near the notched area but also lamellar orientation to loading axis. The high tensile stress leads to the new microcracks nucleate along lamellar interfaces of grains with favorable orientation when local stress intensity reaches the toughness threshold of the material. Thus, both plasticity and high tensile stress are required to cause notched TiAl failure.

 

Key words: TiAl alloys; investment cast; fracture characteristics; in situ SEM observation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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