Metallurgical aspects of deformation processing

提案中更详细地介绍的研究专题概述如下。1.我们将与澳大利亚同事M.Barnett和P.D.Hodgson共同开发一个涵盖静态和亚动态再结晶的综合模型。这将简化工业磨机中轧制负荷的建模。2.建立静态和亚动态再结晶动力学模型。与E.Poliak博士和A.Najafizadeh博士合作，将开发一种方法，允许在由于不完全再结晶而积累加工硬化时预测机架间软化的影响。3.变形奥氏体中的变种选择。一种解释变形奥氏体相变后出现的织构成分的模型正在利用EBSD(电子背散射衍射)技术进行改进。4.陨石的转变特征。陨石在穿过太阳系的过程中冷却非常缓慢。我们将确定在这些条件下发生的相变的特征，以解决在这些条件下适用的一些取向关系问题。5.研究铝镁合金中的粗晶超塑性。虽然超塑性通常与细晶材料有关，但在特定条件下也可以在粗晶金属中产生超塑性。目前正在研究导致这种异常效应的机制，以确定工业应用的可能性。6.镁合金物理冶金的基本原理：人们正在研究镁合金在各种工业条件下的孪生和断裂行为。尤其重要的是成形过程中应变路径和温度的影响。

The research topics described in more detail in the proposal are summarized below. 1.  A Combined Model for Static and Metadynamic Recrystallization.  A single model covering both mechanisms will be developed in association with Australian colleagues M. Barnett and P.D. Hodgson.  This will simplify the modeling of rolling load in industrial mills. 2.  Modeling the Kinetics of Static and Metadynamic Recrystallization.  In collaboration with Drs. E. Poliak and A. Najafizadeh, an approach will be developed permitting the effect of interstand softening to be predicted when work hardening is being accumulated due to incomplete recrystallization. 3.  Variant Selection in Deformed Austenite.  A model that accounts for the texture components that appear after the transformation of deformed austenite is being improved by the use of EBSD (electron backscatter diffraction) techniques. 4.  Transformation Characteristics of Meteorites.  Meteorites cool very slowly during their passage through the solar system.  The characteristics of the phase transformation that takes place under these conditions will be determined so as to resolve some issues regarding the orientation relationships that apply under these conditions. 5.  Coarse-Grained Superplasticity in Al-Mg Alloys.  Although superplasticity is usually associated with fine-grained materials, it can also be produced in coarse-grained metals under particular conditions.  The mechanisms responsible for this unusual effect are being studied with a view to determining the possibility of industrial application. 6.  Fundamentals of the Physical Metallurgy of Magnesium Alloys.  The twinning and fracture behavior of Mg alloys is being studied under various conditions of industrial interest.  Of particular importance are the effects of strain path and temperature during forming operations.