Crack paths of PST crystals of binary Ti-49 at.% Al alloy
- Beijing Univ. of Aeronautics and Astronautics, Beijing (China). Dept. of Materials Science and Engineering
There has been much progress and improvement in understanding the relationship between microstructures and mechanical properties of two-phase gamma titanium aluminide alloys during the past decade years. It has been recognized that the lamellar structure consisting {gamma}-TiAl and {alpha}2-Ti3Al plates is beneficial for fracture toughness and high temperature strength, but unfavorable for ductility. It appears that it is necessary to carry out a systematic study of deformation and fracture processes and mechanisms, and their relationship with microstructural constitutions such as grain size and lamellar spacing, and micro-mechanical analysis and modeling so that the high anisotropy may be optimized in the polycrystal alloys through microstructure control and alloy design. As part of the systematic study, an in-situ experimental study of crack paths of PST crystals of Ti-49at.%Al alloy as a function of the angle ({phi}) between the loading axis and the lamellar planes has been carried out an the results are reported in this note, and further micro-mechanical analysis and modeling of the cracking process are being conducted and will be presented in their coming paper.
- OSTI ID:
- 665172
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 9; Other Information: PBD: 5 Oct 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characteristics, benefits and applications of PST TiAl crystal
Mechanical and microstructural responses and microcrack formation in titanium aluminides at a wide range of strain rate and temperature