MB15-RE镁合金铸坯在半固态温度下的应力-应变曲线测试与特征分析

Experimental Study and Analysis of Stress-strain Curves for the MB15-RE Magnesium Alloys Casting Billet under the Semisolid Conditions

研究了MB15-RE镁合金常规铸坯在半固态温度下应力-应变曲线变化的影响要素。通过热模拟实验,发现MB15-RE在560℃的半固态温度下应力-应变曲线均可分为3个阶段:应力上升阶段、应力下降阶段和应力稳定阶段;同时在相同应变速率下,合金温度越高,其应力峰值和稳态应力越低,表明曲线与在半固态温度下试样中固液态比例相关;在相同温度下,应变速率越大,峰值应力越大而稳态应力越小,表明了再结晶比例越高,稳态应力越低。

The influence factors on stress-strain curves of the MB15-RE magnesium alloys casting billet under the semi-solid conditions were studied.The results of thermal simulation experiment show,the all stress-strain curves in the semisolid temperature of 560 ℃ can be divided into rise,decline and stabilization stages.And under the constant strain rate,the higher temperature can reduce both the peak and steady-state stresses of MB15-RE,which shows the curves are affected by the ratio of phase of samples.In addition,under the same temperature the higher strain-rate can lead to the greater peak and lower steady-state stresses,which shows the greater ratio of recrystallization can lead to lower stabilization stress.