Deformation microstructures in Ni-3(Al, Hf)

• Published in: Materials Science and Engineering A -Structural Materials Properties Microstructure and Processing (ISSN: 0921-5093), vol. 240, p. 174-179
• Publication date: 1997

The dislocation structures resulting from compression tests on Ni-3 (Al, I-If) single crystals are studied as a function of the deformation temperature between 77 and 900 K. Mechanical parameters are also reported, such as the 0.2% offset stress, the work-hardening coefficient, the microscopic activation volume and the dislocation exhaustion rate. The two latter parameters are measured using repeated load relaxation experiments. It is shown that the microstructural features are qualitatively similar to those reported for other Ni3Al compounds: Kear Wilsdorf locks are observed in the temperature domain which corresponds to the strength anomaly, the peak temperature seems to be associated with the occurrence of cube slip. Therefore, the spectacular strengthening due to I-If additions is discussed in terms of other parameters of the dislocation structure such as the complex stacking fault energy. (C) 1997 Elsevier Science S.A.

Reference

• CRPP-ARTICLE-1997-033
• doi:10.1016/S0921-5093(97)00578-9
• View record in Web of Science

Record created on 2008-04-16, modified on 2017-05-12