新聞資訊
溫熱彎曲成形過程中AZ31鎂合金型材的微觀織構(gòu)演變
發(fā)布人：上海艾荔艾金屬材料有限公司www.bt990.com.cn
更新時間：2015-12-08
采用光學顯微鏡、X射線衍射儀和EBSD分析研究AZ31鎂合金型材溫熱彎曲成形前后橫截面外側(cè)微觀組織和織構(gòu)的演變規(guī)律。
溫熱彎曲成形過程中AZ31鎂合金型材的微觀織構(gòu)演變Microtexture evolution of?AZ31 magnesium alloy profile during warm bending process
采用光學顯微鏡、X射線衍射儀和EBSD分析研究AZ31鎂合金型材溫熱彎曲成形前后橫截面外側(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軸的應變，因而提高型材的塑性變形能力。
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.
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