The Role of Interfaces in Superplasticity with Emphasis on Intermetallic Compounds

小行星9300217 本研究探讨了金属间化合物超塑性变形的基本机制，特别强调了界面的作用。 超塑性是某些晶体材料在高温下经受大的无颈拉伸应变的能力。 超塑性的一个重要特征是晶界滑动现象。 本研究探讨晶粒与相界面对超塑性过程之影响。 调查领域包括合作晶界迁移的作用，由于晶界滑动与相关的机械测试参数的内摩擦的测量，和界面背应力的影响的速率参数的本构方程超塑性。 这项研究的目的是提高对超塑性行为的理解，并解决这一现象在金属间化合物合金中的应用。 研究结果对材料的近终成形加工和自动化制造具有重要的参考价值。 ***

9300217 Mukherjee This research examines fundamental deformation mechanisms of superplasticity in intermetallics with special emphasis on the role of interfaces. Superplasticity is the ability of some crystalline materials to undergo large neck-free tensile strain at elevated temperatures. An important feature of superplasticity is the phenomenon of grain boundary sliding. This research explores the influence of grain and phase interfaces on the superplasticity process. Areas of investigation include the role of cooperative grain boundary migration, measurements of internal friction due to grain boundary sliding with correlations to mechanical testing parameters, and effects of interfacial back stress on the rate parameters in the constitutive equation for superplasticity. %%% This research is aimed at improved understanding of superplastic behavior and addresses the application of this phenomenon to intermetallic alloys. The results are valuable to near-net shape processing of materials and automated manufacturing. ***