Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575140 | Materials Science and Engineering: A | 2014 | 9 Pages |
Abstract
The effect of pre-deformation on precipitation hardening response as well as the work-hardening behavior of a binary Mg-Ca alloy are investigated. Our results show that application of 5% pre-deformation increases the precipitation hardening response of the material and decreases the annealing time by 50%. The dislocations introduced during the pre-deformation process act as predominant nucleation sites and result in a higher number of precipitates of smaller size. During the thermomechanical treatments, the work hardening behavior is altered by the state of the precipitates, namely, under-aged, peak-aged and over-aged. After the elastic-plastic transition, under-aged and peak-aged materials show a continuously decreasing work-hardening rate, while the over-aged material has an initial constant work-hardening rate. The absolute values of the work hardening rate are far less sensitive to the precipitation stage compared to aluminum alloys; a fact that explains the low work hardening capacity of magnesium compared to aluminum.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
M. Lalpoor, A. Miroux, C.L. Mendis, N. Hort, S.E. Offerman,