High Temperature Compressive Creep Behavior of Al-Fe Series Aluminum Alloy Conductor Material for Cable
Compressive creep tests at constant stress(63.6,72.6,78.3,84.7 MPa)at high temperature(90 ℃)were carried out on Al-Fe series aluminum alloy conductor material for cable.The effect of the compression stress σ on the steady state creep rate(ε)was studied.The compressive creep constitutive equation was established,and the mechanism of the compressive creep was analyzed.The results show that the steady state creep rate of aluminum alloy samples increased exponentially with the increase of compressive stress.The creep constitutive equation of the aluminum alloy sample at 90 ℃ was(ε)=σ9,27 e-52.2,the correlation coefficient between the fitting curve and the test result reached 0.997 6.There was threshold stress during creep process of alumium alloy,which was 34.2 MPa.The threshold stress was introduced to modify the creep equation.The relative error between the calculated steady state creep rate by the modified equation and the test value was 8％,which proved that the model was accurate.The true stress exponent was 5,indicating the compressive creep behavior of Al-Fe series aluminum alloy material for cable at 90 ℃ was the second phase particle strengthened creep-like behavior dominated by dislocation climbing mechanism.
aluminum alloycompressive creepsteady state creep ratecreep constitutive equationcreep mechanism
NETL
NSTL
万方数据
