Temperature dependence of fracture toughness of the cubic (L1{sub 2}) titanium trialuminides
Book
·
OSTI ID:571722
- Univ. of Waterloo, Ontario (Canada). Dept. of Mechanical Engineering
Fracture toughness vs. temperature of the cubic (L1{sub 2}), Mn- modified titanium trialuminide (based on Al{sub 3}Ti) was investigated in air at the temperature range up to 1,000 C. Toughness calculated from the maximum load exhibits a broad peak (K{sub Q} {approx} 7--10 MPam{sup 0.5}) at the 200--500 C temperature range and then decreases with increasing temperature, reaching a room temperature value of {approximately}4.5 MPam{sup 0.5} at 1,000 C. However, the work of fracture ({gamma}{sub WOF}, J/m{sup 2}) and the stress intensity factor calculated from it (K{sub 1WOF}) increases continuously with increasing temperature. Fracture modes exhibit a gradual transition from transgranular cleavage at room temperature to predominantly intergranular failure at the 800--1,000 C range.
- Sponsoring Organization:
- Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
- OSTI ID:
- 571722
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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