Title of article :
The interaction of precipitation and deformation in a binary Mg–Ca alloy at elevated temperatures
Author/Authors :
Lalpoor، نويسنده , , M. and Miroux، نويسنده , , A. and Mendis، نويسنده , , C.L. and Hort، نويسنده , , N. and Offerman، نويسنده , , S.E.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
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.
Keywords :
Precipitation , Mg–Ca alloys , Thermomechanical treatment , work hardening , Materials scarcity
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A