Creep of anomalous Ni{sub 3}Ga
- Univ. of Oxford (United Kingdom)
Ni{sub 3}Ga is among a number of L1{sub 2} ordered intermetallic alloys whose yield stress increases with temperature. In this work the authors have examined the creep strength of [{bar 1}23] and [001] oriented Ni{sub 3}Ga specimens in the temperature regime of the yield stress anomaly and confirmed that the creep strength shows the normal rapid decrease with temperature. Inverse creep occurs in the [001] specimens where slip is on the {l_brace}111{r_brace} planes only. [{bar 1}23] specimens exhibit steady-state creep and slip line and TEM observations have shown slip on the cube plane and dislocations of both <110> and <100> Burgers vectors are present. They have carried out creep tests of prestrained [{bar 1}23] samples and demonstrated that the storage of primary <110>{l_brace}111{r_brace} screw dislocations, locked in the Kear-Wilsdorf configuration, has no effect on creep.
- OSTI ID:
- 571882
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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