【摘要】 采用金属型铸造及平面压缩制备了不同Y含量的变形态Mg-Y合金,研究了Y含量及温度对其力学性能的影响。结果表明,变形态Mg-Y合金沿试样径向(TD)和轴向(ED)方向进行压缩时,具有明显的力学各向异性,但随着Y含量增加以及温度升高,力学各向异性降低。室温(20℃)下,当Y含量从0增加到3.02%时,TD与ED方向的强度差由82 MPa减小到34 MPa;300℃时,Mg-3.02Y合金沿TD和ED方向压缩的应力-应变曲线几乎重合,力学各向异性趋于消失。Mg-Y合金随Y含量及温度增加,各向异性降低的主要原因是Mg-Y合金的{0002}基面织构弱化以及非基面滑移系开动。更多还原

【Abstract】 The wrought Mg-Y magnesium alloys with varied yttrium content were fabricated by permanent mold casting and plain compressing.The effects of yttrium content and temperature on mechanical anisotropy of Mg-Y alloys were investigated.The results reveal that the alloy containing Y presents the apparent mechanical anisotropy with compressed along radial(TD)and axial(ED)of cylinder samples of Mg-Y alloys.However,the anisotropy is decreased with increasing in yttrium content and temperature.At room temperature,the difference of strength between TD and ED directions is decreased from 82 MPa to 34 MPa when yttrium content is increased from zero to 3.02%.At 300℃,the two curves of the stress-strain diagram compressed along TD and ED direction almost completely coincide,showing the disappearance of mechanical anisotropy.The decrease of the mechanical anisotropy is attributed to the weakened{0002}basal texture and the activation of non-basal slips with increasing in yttrium and temperature.更多还原