(1. 中國科學(xué)院 金屬研究所，沈陽 110016；
2. 大連理工大學(xué) 材料科學(xué)與工程學(xué)院，大連 116085；
3. Department of Mechanical Engineering and Science, Kumamoto University, Kumamoto 8608555, Japan)
摘 要: 采用光學(xué)顯微鏡、X射線衍射儀和EBSD分析研究AZ31鎂合金型材溫?zé)釓澢尚吻昂髾M截面外側(cè)微觀組織和織構(gòu)的演變規(guī)律。結(jié)果表明：彎曲成形前，型材為 平行于擠壓方向的線織構(gòu)；彎曲成形后，型材線織構(gòu)被削弱。彎曲過程中拉伸孿晶數(shù)量減少，由彎曲前的5.39%降低至彎曲后的2.22%；壓縮孿晶增多，由彎曲前的0.141%增加至彎曲后的0.222%。擠壓型材的大量拉伸孿晶使得應(yīng)力集中，協(xié)同溫度的影響，非基面滑移開動并協(xié)調(diào)了晶粒c軸的應(yīng)變，因而提高型材的塑性變形能力。
關(guān)鍵字: AZ31鎂合金；溫?zé)釓澢晃⒂^織構(gòu)
AZ31 magnesium alloy profile during warm bending process
（1. Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China;
3. Department of Mechanical Engineering and Science, Kumamoto University, Kumamoto 8608555, Japan）
Abstract:The microstructure and microtexture evolution at the outside of the cross-section of AZ31 magnesium alloy profile before and after warm bending were investigated by using optical microscope, X-rays diffractometer and electron back scattering diffraction (EBSD) analysis system. The results indicate that the microtexture of the profile before bending is line texture with parallel to the extrusion direction. The intensity of line texture of the profile after bending is reduced. During the warm bending process, the amount on the extension twins decrease from 5.39% to 2.22%. Whereas, the amount of the compression twins increases from 0.141% to 0.222%. Under condition of the stress concentration caused by lots of extension twins and the effect of temperature, the non-basal slip systems are activated which coordinate the deformation of the c-axis. As a result, the plastic property of profile is improved.
Key words: AZ31 magnesium alloy; warm bending; microtexture
