The Role of Interfaces in Superplasticity with Emphasis on Intermetallic Compounds

界面在超塑性中的作用，重点是金属间化合物

• 批准号: 9300217
• 负责人: Amiya Mukherjee
• 金额: $ 36.6万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9300217&HistoricalAwards=false
• 关键词: Role; Interfaces; Superplasticity; Emphasis; Intermetallic

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. ***

9300217慕克吉这项研究考察了金属间化合物超塑性的基本变形机制，特别强调了界面的作用。超塑性是指某些晶体材料在高温下承受大的无颈拉应变的能力。超塑性的一个重要特征是晶界滑移现象。本研究探讨了晶界和相界对超塑性过程的影响。研究领域包括晶界协同迁移的作用，晶界滑动内耗的测量及其与力学测试参数的相关性，以及界面背应力对超塑性本构方程中速率参数的影响。这项研究旨在提高对超塑性行为的理解，并将这一现象应用于金属间化合物合金。研究结果对材料的近净成形加工和自动化制造具有一定的参考价值。***