摘要
The creep behaviors of as-cast Mg-5Zn-2.5Er alloy(mass fraction,%) ,under various applied stresses(50-70 MPa) and creep temperatures(150-200℃) for 100 h,were investigated.The stress exponent n is in the range of 1.5-5.8,and the activation energy Qc is in the range of 28.3-77.1 kJ/mol.With respect to the calculated n and Qc as well as the microstructures after creep,it is suggested that there is a transition region between grain boundary sliding(GBS) dominated creep to dislocation creep mechanism(from n<3 to n>3) ,arising in the steady-stage creep rate value of 2.89×10-9 s-1.
The creep behaviors of as-cast Mg-5Zn-2.5Er alloy （mass fraction, %）, under various applied stresses （50-70 MPa） and creep temperatures （150-200 ℃） for 100 h, were investigated. The stress exponent n is in the range of 1.5-5.8, and the activation energy Qc is in the range of 28.3-77.1 kJ/mol. With respect to the calculated n and Qc as well as the microstructures after creep, it is suggested that there is a transition region between grain boundary sliding（GBS） dominated creep to dislocation creep mechanism （from n〈3 to n〉3）, arising in the steady-stage creep rate value of 2.89× 10^-9 s^-1.
基金
Project(2007CB613706) supported by the National Basic Research Program of China
