Study of Tensile Properties and Fracture Mechanisms of Fully Lamellar TiAl Based Alloy

Abstract:

The tensile properties and fracture mechanisms of fully lamellar TiAl based alloy was studied by room and high temperature (400°C) tensile test. The results indicated that: the crack initiated between weak lamellar interfaces．With tension increased, the cracks extended along lamellar direction. Crack propagation resistance was enhanced at colony boundary. Ligaments broke while load increased, and then the main crack and microcrack linked. The fracture process was that the main crack occurred firstly, microcrack appeared and then propagated, the main crack and microcrack were linked，and the alloy fractured finally; The ductility of the alloy at 400°C was superior to that at room temperature; The fracture mechanism of the fully lamellar TiAl based alloy is brittle cleavage fracture.

• Periodical: Applied Mechanics and Materials (Volumes 66-68)
• Pages: 1106-1111
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.66-68.1106
• Online since: July 2011
• Authors: Bin Tang, Chuan Jing Chen, Zhi Yong Xue, Chung Jing Wu, Shuang Shou Li
• Keywords: Crack Propagation, Fracture Machanism, Tensile Properties, TiAl-Based Alloy

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