强基面织构AZ31合金压缩过程中的孪晶对行为

Paired Twinning Behavior During Compression of Strongly Basal Textured AZ31 Alloy

挤压态AZ31合金在室温下沿挤压方向进行压缩变形,合金中产生大量的拉伸孪晶。综合分析了孪晶对的斯密特因子(SF)和应变兼容因子(m_f),其中孪晶对包括相连的孪晶对和非相连的孪晶对。结果表明:相连的孪晶对优先在取向差约为25°的相邻晶粒的晶界上形核。大约88%的相连孪晶对具有很高的斯密特因子,大约76%的相连孪晶对具有很高的应变兼容因子。低斯密特因子的孪晶对的发生能够通过高应变兼容因子进行解释。大约23%的非相连孪晶对的应变兼容因子接近于0。

An extruded AZ31 alloy was compressed along the extrusion direction at room temperature.Profuse tensile twins were activated.Paired twins including the connected twin pairs and randomly paired twins(unconnected twins) were studied by a combined analysis of Schmid factor(SF) and strain compatibility factor(mf).The results show that the nucleation of connected twin pairs preferentially occurs in the neighboring grains with a misorientation of 25°.About 88% of the connected twins have high Schmid factor and about 76% of the connected twins show high strain compatibility factor.The occurrence of connected twin pairs with low values of Schmid factor is well interpreted by their high values of strain compatibility factor.Approximately 22% of the unconnected twin pairs have the strain compatibility factor values of zero.