Microstructure Evolution of Extruded Mg-6Gd Alloy Under 175 ℃ and 150 MPa

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2019,（2）
• 页码范围: 245-252
• 页数: 8页
• 语种: 英文

摘要

The tensile creep behavior of extruded Mg-6Gd alloy,having the tensile yield strength of ～ 110 MPa at 175 ℃,has been investigated under 175 ℃ and 150 MPa.In this study,the extruded Mg-6Gd sample exhibits the total tensile strain of ～ 10.5％ after the creep time of 1100 h,and the fast plastic strain of ～ 4.6％ at the beginning of the creep test.The microstructure result suggests that the dislocation deformation is the main deformation mode during creep,and the grains with orientation close to <0001> ‖ ED disappear after creep.The creep process containing a low creep strain has no effective promotion for the precipitation compared with the aging process without strain.The origination of creep crack is related to the formation of precipitate-free zone during creep.The work offers an important implication to research the microstructure evolution under an applied stress in a weak aging response Mg alloy.