(上海交通大學(xué) 機(jī)械與動(dòng)力工程學(xué)院，上海 200240)
摘 要: 利用電子背散射衍射(EBSD)取向成像技術(shù)，分析AZ31鎂合金熱擠壓棒材和軋制薄板的織構(gòu)特點(diǎn)；對(duì)具有不同初始織構(gòu)的鎂合金棒材和薄板進(jìn)行力學(xué)性能分析，并從織構(gòu)角度分析棒材的拉壓不對(duì)稱性和薄板的力學(xué)各向異性。結(jié)果表明：擠壓鎂合金棒材具有主要以(0001)基面平行于擠壓方向的基面纖維織構(gòu)，存在嚴(yán)重的拉壓不對(duì)稱性，其原因在于壓縮時(shí)的主要變形方式為 < >孿生；熱軋鎂合金薄板具有主要以(0001)基面平行于軋面的強(qiáng)板織構(gòu)，具有顯著的力學(xué)性能各向異性，其原因在于拉伸時(shí)不同方向的基面滑移Schmid因子不同。
關(guān)鍵字: AZ31鎂合金；織構(gòu)；力學(xué)性能
AZ31 magnesium alloy
（School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The textures of both as-extruded rod and as-rolled sheet of AZ31 magnesium alloys were investigated by the electron back scattering diffraction (EBSD) technique. The influences of the initial textures on the mechanical properties in two different magnesium alloy behaviors, extruded rod and rolled sheet, were examined. The tensile-compressive asymmetry of extruded rod and mechanical anisotropy of rolled sheet were studied in the sight of texture. The EBSD results show that the major texture of as-extruded AZ31 rod is the fiber texture with (0001) basal plane parallel to the extrusion direction (ED), while the major texture of as-rolled AZ31 sheet is the basal texture with (0001) basal plane parallel to the rolling surface. The mechanical property tests show that the activity of < > twinning during compression exerts significant effect on the tensile-compressive yield stress and elongation rate in an asymmetrical way. The different Schmid factors of basal slip systems in different directions lead to the in-plane anisotropy during tension.
Key words: AZ31 magnesium alloys; texture; mechanical property
