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High-Strain-Rate Superplasticity in Metallic Materials and the Potential for Ceramic Materials

机译：金属材料的高应变速率超塑性和陶瓷材料的潜力

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摘要

High-strain-rate Superplasticity (i.e., superplastic behavioral strain rates over 10~(-2) s~(-1)) has been observed in many metallic materials such as aluminum alloys and their matrix composites and it is associated with an ultra-fine grained structure of less than about 3 μm. Its deformation mechanism appears to be different from that in conventional superplastic materials. Experimental investigations showed that a maximum elongation was attained at a temperature close to the partial melting temperature in many superplastic materials exhibiting high-strain-rate Superplasticity. Recently, a new model, which was considered from the viewpoint of the accommodation mechanism by an accommodation helper such as a liquid or glassy phase, was proposed in which Superplasticity was critically controlled by the accommodation helper both to relax the stress concentration resulting from the sliding at grain boundaries and/or interfaces and to limit the build up of internal cavitation and subsequent failure. The critical conditions of the quantity and distribution of a liquid phase for optimizing superplastic deformation was discussed and then applied to consider the possibility of attaining high-strain-rate Superplasticity in ceramic materials.
机译：在许多金属材料（例如铝合金及其基体复合材料）中观察到高应变率超塑性（即超塑性行为应变率超过10〜（-2）s〜（-1）），并且与超塑性有关。小于约3μm的细晶粒结构。它的变形机理似乎与传统的超塑性材料不同。实验研究表明，在许多具有高应变速率超塑性的超塑性材料中，在接近部分熔融温度的温度下可获得最大伸长率。最近，提出了一种新的模型，该模型从诸如液相或玻璃态的调节辅助物的调节机理的观点出发被考虑，其中超塑性由调节辅助物严格地控制，以减轻由滑动引起的应力集中。在晶界和/或界面处，以限制内部气蚀的形成和随后的破坏。讨论了用于优化超塑性变形的液相数量和分布的临界条件，然后将其应用于考虑在陶瓷材料中获得高应变速率超塑性的可能性。

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