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通过室温包套挤压,使镁合金产生不同应变量的预应变,从而获得具有不同孪晶比例的组织,并对预应变合金的拉伸及压缩性能进行了测试。结果表明:随着预应变变形量的增加,组织中的{1011}压缩孪晶的数量越来越多,材料的拉伸和压缩性能都明显提高,而且预应变样品拉伸过程中的屈服强度明显高于压缩过程中的屈服强度。这表明由于预应变的施加,在压缩过程中产生了包辛格效应,使材料在反向压缩过程中的屈服强度明显降低;另一方面,计算所得包辛格效应的能量参数(BEP)值随着应变量的增加而逐渐减小,表明随着应变量增加包辛格效应逐渐减弱。
By room temperature sheathing and extrusion, the magnesium alloy was prestressed with different strain amount to obtain the structure with different twins ratio. The tensile and compressive properties of the pre-stressed alloy were tested. The results show that as the amount of pre-strain deformation increases, the number of {1011} compressive twins in the structure increases and the tensile and compressive properties of the material increase obviously. Moreover, the yield strength Obviously higher than the yield strength during compression. This indicates that the Bauschinger effect is generated during the compressing process due to the prestrain applied, so that the yield strength of the material during the reverse compressing process is significantly reduced. On the other hand, the calculated energy parameter (BEP) value of the Bauschinger effect As the amount of strain increases, it gradually decreases, indicating that the Bauschinger effect gradually decreases as the amount of strain increases.