Papers by Author: Ke Jie Li

Abstract: The Mg-12Gd-2Y-0.5Sm-0.5Sb-0.5Zr (wt.%) alloy was prepared by casting technology. The microstructure of alloy was then investigated after T6 heat treatment. The results show that at 523K, the alloy has shown the superior tensile strength (i.e. 345.5 MPa). When experimental alloy was stretched with temperature increasing from 293K to 523K, the increases of deformation strengthening and critical crack propagation stress caused the anomalous temperature dependence of tensile strength.

Abstract: The Mg-12Gd-2Y-0.5Sm-0.5Sb-0.5Zr alloy was prepared under flux protection. The morphology and crystal structure of β′ precipitate phases in aged alloy has been studied using transmission electron microscopy and X-ray diffraction. The orientation relationship between β′ precipitate and matrix could existed as [ 010]B_αB// [ 00]Bβ′B, (01 0) BαB// (020)B_β′B and (0001)B_αB was coherent with (001)B_β′B; [0001]B_αB// [001]B_β′B, (1 00)B_αB// (240)B_β′B and ( 010)B_αB was coherent with (0A^_,8EEA0)B_β′B. The HREM images indicated that the β' precipitates have a long-period ordered structure at the same time.