新聞資訊
擠壓態(tài)AM30鎂合金的動(dòng)態(tài)力學(xué)行為及變形機(jī)制
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時(shí)間：2015-12-16
采用分離式Hopkinson壓桿和反射式拉桿裝置在室溫對(duì)擠壓態(tài)AM30鎂合金進(jìn)行動(dòng)態(tài)壓縮和拉伸試驗(yàn)，分析AM30鎂合金在沿?cái)D壓方向(ED)和橫向(TD)壓縮和拉伸時(shí)的變形機(jī)制，計(jì)算AM30鎂合金在ED和TD方向壓縮和拉伸時(shí)的應(yīng)變速率敏感系數(shù)，并通過(guò)SEM觀察斷口形貌。
擠壓態(tài)AM30鎂合金的動(dòng)態(tài)力學(xué)行為及變形機(jī)制Dynamic mechanical behavior and deformation mechanism of?extruded AM30 magnesium alloy
采用分離式Hopkinson壓桿和反射式拉桿裝置在室溫對(duì)擠壓態(tài)AM30鎂合金進(jìn)行動(dòng)態(tài)壓縮和拉伸試驗(yàn)，分析AM30鎂合金在沿?cái)D壓方向(ED)和橫向(TD)壓縮和拉伸時(shí)的變形機(jī)制，計(jì)算AM30鎂合金在ED和TD方向壓縮和拉伸時(shí)的應(yīng)變速率敏感系數(shù)，并通過(guò)SEM觀察斷口形貌。結(jié)果表明：沿ED方向壓縮時(shí)，拉伸孿晶{ }á ?是主要變形機(jī)制，屈服強(qiáng)度對(duì)應(yīng)變速率不敏感；沿ED方向拉伸以及TD方向壓縮和拉伸時(shí)，拉伸孿晶不能啟動(dòng)，位錯(cuò)滑移參與變形，應(yīng)變速率敏感系數(shù)提高；AM30鎂合金在ED方向表現(xiàn)出很強(qiáng)的拉壓不對(duì)稱性，壓縮/拉伸屈強(qiáng)比約為0.38，在TD方向則無(wú)明顯的拉壓不對(duì)稱性；AM30鎂合金在動(dòng)態(tài)壓縮和拉伸時(shí)斷口形貌呈韌脆混合的斷裂特征。
The dynamic compressive and tensile tests on the extruded AM30 magnesium alloy were carried out at room temperature using a split Hopkinson pressure bar and a reflected Hopkinson tension bar apparatus. The deformation mechanisms of the AM30 magnesium alloy under the dynamic compression and tension loading along the extruding direction (ED) and the transverse direction (TD) were analyzed. The strain rate sensitivity coefficients of the alloy under different conditions were calculated and the dynamic fractograph of the alloy was analyzed. The results show that, when the alloy is compressed along the ED, tension twining { }á ? is the main deformation mechanism, and the yield stress of the alloy is insensitive to the strain rate. When the alloy is tested under tension along the ED and under tension and compression along TD, tension twining { }á ? is not initiated, while the dislocation slip is responsible for the plastic deformation, resulting in the fact that the strain rate sensitivity becomes higher. The asymmetry of the tension-compression of AM30 magnesium alloy is much pronounced along the ED and the yield stress ratio of compression to tension is about 0.38. The fractograph of the alloy is mix-fractured morphology under dynamic compressive and tensile conditions.
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