The MgZnY alloys were prepared by directional solidification, and the effect of loading modes on mechanical anisotropy and deformation mechanism of the alloys was studied. The microstructure of the alloy is columnar crystals whose growth orientations are mainly concentrated in <110>. When the tensile load is parallel to longitudinal grain boundaries of columnar crystals, the alloy has high yield strength (232 MPa), owing to basal slip with hard orientation and {101} contraction twinning with high critical resolved shear stress (CRSS), but work hardening is not obvious. When the compressive load is parallel to longitudinal grain boundaries of columnar crystals, the alloy has high compressive strength (337 MPa) and good plasticity (maximum strain, 24 %), as well as distinct work hardening, which are related to (111) [11] twins and good strain compatibility of grain boundaries. When the compressive load is perpendicular to longitudinal grain boundaries, the alloy shows high plasticity (maximum strain, 31 %) because the strip-like extension twins are parallel to the longitudinal grain boundaries during deformation.

中文翻译：

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特定取向柱状晶Mg-Zn-Y合金的力学各向异性


采用定向凝固技术制备了MgZnY合金，研究了加载方式对合金力学各向异性和变形机制的影响。该合金的显微组织为柱状晶，其生长方向主要集中在<110>。当拉伸载荷平行于柱状晶的纵向晶界时，由于具有硬取向的基底滑移和具有高临界分辨剪切应力（CRSS）的{101}收缩孪晶，该合金具有高屈服强度（232 MPa），但工作硬化不明显。当压缩载荷平行于柱状晶纵向晶界时，该合金具有较高的抗压强度（337 MPa）和良好的塑性（最大应变，24 %），以及明显的加工硬化，这与（111）有关[ 11]孪晶和良好的晶界应变相容性。当压缩载荷垂直于纵向晶界时，由于变形过程中条状延伸孪晶平行于纵向晶界，合金表现出高塑性（最大应变，31%）。