镁合金薄板材剪切诱导织构弱化和性能提升的研究进展

Recent progress on shear induced texture weakening and property improvement of magnesium alloy thin sheet

摘要:

镁合金薄板因强基面织构制约,室温成形能力不足,工业应用受到极大限制。本文从镁合金板材织构弱化的机理出发,突出剪切诱导孪晶启动实现镁合金薄板织构弱化的可行性以及存在的机理不明问题。结合孪晶实现镁合金薄板材织构弱化的工艺发展,讨论目前剪切变形工艺在镁合金薄板材加工应用的优点和不足。针对复杂应力状态下滑移和孪晶启动的机理不明以及剪切变形诱导镁合金织构弱化的工艺不足,分别提出了等效Schmid因子和等通道弯曲技术,并说明了新计算理论和新剪切加工技术在镁合金薄板材方面的应用。

Abstract:

Due to the restriction of strong basal texture, the formability of the thin magnesium alloy sheets at room temperature is insufficient, and its industrial application is greatly limited. Based on the mechanism of texture weakening of Mg alloy sheets, this paper highlights the feasibility and unclearly mechanism problems of shear induced twinning actviaiton to realize texture weakening of magnesium alloy sheets. Combined with the process development for activating twinning to weaken the texture of magnesium alloy sheets, the features and limations of shear contained technology in Mg alloy sheets are discussed. Given the undelying mechanism of slip and twinning actviaiton under complex stress and lacing of technology for shear-induced texture weakening of Mg alloys, An effective Schmid factor and an equal channel angular bending technology were proposed respectively, and the application of the new calculation theory and shear processing technology in Mg alloy sheets was presented.