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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Internal variable approach to microstructural change in 7475 aluminium alloy during superplastic deformation
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Internal variable approach to microstructural change in 7475 aluminium alloy during superplastic deformation

机译：内变量法研究7475铝合金超塑性变形过程中的显微组织变化

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摘要

Flow behaviour and microstructural changes in fine grained 7475 Al during superplastic deformation have been investigated. A series of mechanical tests and transmission electron micrography has been conducted at various temperatures ranging from 430 to 516℃. Quantitative constitutive parameters have been determined from load relaxation tests by applying the internal variable theory of structural superplasticity proposed recently. The validity of the mechanical analysis is proved by the evolution of the microstructure (precipitate free zones PFZs) during the accommodation process. Additional information about the mechanism of PFZ formation was determined by microchemical analysis.
机译：研究了超塑性变形过程中细晶粒7475 Al的流动行为和微观结构变化。在430至516℃的不同温度下进行了一系列的机械测试和透射电子显微照相。通过应用最近提出的结构超塑性的内部变量理论，从载荷松弛试验中确定了定量的本构参数。力学分析的有效性通过调节过程中微观结构的演变（沉淀自由区PFZs）得到了证明。通过微化学分析确定了有关PFZ形成机理的其他信息。

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