A Scandium Modified Al-0.7 Fe Binary Alloy: Improvement of Creep- Resistance PropertyJiayi Zhang1, Xinyang Jiang1, Mingyang Ma1, Bin Wang1,2*, Danqing Yi1,2 and Bo Jiang1
- *Corresponding Author:
- Bin Wang
School of Material Science and Engineering Central
South University, Changsha 410083, PR China
Tel: +86 731 88836320;
E-mail: [email protected]
Received date: February 25, 2017; Accepted date: March 06, 2017; Published date: March 12, 2017
Citation: Zhang J, Jiang X, Ma M, Wang B, Yi D, et al. (2017) A Scandium Modified Al-0.7 Fe Binary Alloy: Improvement of Creep-Resistance Property. J Civil Environ Eng 7:269. doi:10.4172/2165-784X.1000269
Copyright: © 2017 Zhang J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The creep behaviors and microstructures of Al-0.7Fe and Al-0.7Fe-0.2Sc alloy are investigated through creep tests, optical microscope, electron probe micro-analyze and transmission electron microscope observations. It is found that the steady state creep rates of Al-0.7Fe-0.2Sc are smaller than that of Al-0.7Fe under different temperatures at 70 Mpa. An overview of microstructure is given, the interactions between intermetallic phases and dislocations are investigated, with an emphasis on the Al3Sc precipitates. The mechanism controlling creep-resistance is explained by Orowan strengthening mechanism. The magnitude of Δσ Or can afford dislocations to bypass Al3Sc precipitates in Al-0.7Fe-0.2Sc alloy. The counter flow of the vacancies and solute atoms are induced to expound the dislocation motion mechanism.