Microstructure Evolution of Extruded Mg–6Gd Alloy Under 175 °C and 150 MPa
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The tensile creep behavior of extruded Mg–6Gd alloy, having the tensile yield strength of ~ 110 MPa at 175 °C, has been investigated under 175 °C 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.
KeywordsMg–Gd alloy Texture Creep Precipitates Crack
This study was supported by the National Natural Science Foundation of China (Grant Nos. 51201158 and 51871069), Natural Science Foundation of Liaoning Province of China (20180550299 and 20180551117), the Natural Science Foundation of Heilongjiang Province of China (E2017030), the Science Research Project of Liaoning Province Education Department (Grant Nos. L2016004 and LQ2017014), the Liaoning Province Doctor Startup Fund (Grant No. 20170520390), the Fundamental Research Funds for the Central Universities (Grant No. HEUCFM181002), and the Shenyang Science and Technology Plan Projects (Grant No. F16-228-6-00).