Evolution rule of microstructure of AZ91 magnesium alloy welded joint after T4 treatment
LIU Zheng-jun
QU Jia-xing
SU Yun-hai
Abstract：In order to clarify the effect of technological parameters of solid solution (T4)treatment on the evolution rule of microstructure of AZ91 magnesium alloy welded joint,the optimization design for T4 treatment technological parameters is necessary to determine the optimal heat treatment technology.After the heat treatment,the microstructure and mechanical properties of welded joint were investigated with the optical microscope (OM),scanning electron microscope (SEM)and tensile testing machine.The results show that the T4 treatment can change the microsrtructural morphologies of welded joint,affect the location of second phase β-Mg17 Al12 ,and increase the grain size specifically in the coarse-grained zone.The reasonable T4 technological parameters can improve the ultimate tensile strength and plasticity,but decrease the hardness.The optimum technological conditions of solid solution treatment for the AZ91 magnesium alloy is 420 ℃ ×15 h,and the ultimate tensile strength is 274.28 MPa.
Keywords：AZ91 magnesium alloywelded jointT4 treatmentultimate tensile strengthgrain sizereduction in areahardnessXRD spectrum
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 642-646 )