Superplasticity-like creep behavior of coarse grained ternary Al alloys

作者：Qiao Jun^*; Taleff E M

来源：Transactions of Nonferrous Metals Society of China, 2010, 20(4): 564-571.

DOI：10.1016/S1003-6326(09)60179-5

• Al-Mg alloys
• superplasticity
• solute-drag creep
• tensile ductility
• strain-rate sensitivity

Enhanced tensile ductilities in coarse grained Al-Mg-Zn and Al-Mg-Fe materials were studied. The materials were Al-2Mg-5Zn, Al-3Mg-5Zn, Al-4Mg-5Zn, Al-3Mg-0.11Fe, Al-3Mg-0.27Fe, and Al-3Mg-0.40Fe. Tensile elongation-to-failure tests were conducted at constant cross-head speed and constant temperatures from 300 to 450 degrees C. Strain rate change tests were conducted at a constant temperature from 300 to 450 degrees C and in strain-rate range from 4.31 x 10(-5) to 1.97 x 10(-2) s(-1). Experimental results show that over 100% ductilities are consistently achieved in these materials. This superplasticity-like behavior is rate-controlled by solute-drag creep. Although ternary Zn and Fe additions do not have an adverse effect on solute-drag creep and ductility, they increase stress exponent and its sensitivity to Mg content during solute-drag creep.

• 出版日期2010-4
• 单位辽宁科技大学