Ostwald ripening of precipitates

高温合金 动态应变时效 材料科学 奥斯特瓦尔德成熟 可塑性 延展性(地球科学) 流量(数学) 锯齿状 冶金 应变率 合金 机械 复合材料 蠕动 纳米技术 物理
作者
M. Kahlweit
出处
期刊:Advances in Colloid and Interface Science [Elsevier BV]
卷期号:5 (1): 1-35 被引量:288
标识
DOI:10.1016/0001-8686(75)85001-9
摘要

Dynamic Strain Ageing (DSA) has reached widespread acceptance since its proposal in the 1940’s as the mechanism behind the Portevin-Le Chatelier effect in ferritic steels. However, it remains an open question as to whether the classical mechanism can be extended to Face-Centred Cubic (FCC) alloys, including nickel-based superalloys, as often implicitly assumed. Given the historical link between serrated flow and loss of ductility in steels, understanding such consequences in superalloys used in key components of a jet engine demands attention. This review compares plastic instabilities in superalloys to those in ferritic steels, including the effects of temperature, strain rate, compositional, microstructural and extrinsic testing parameters on the extent of serrated flow and consequences on mechanical properties. Outstanding issues are discussed in detail, relating both to the lack of a complete experimental argument depicting the origins of serrated flow and different serration ‘Types’, as well as the inability of current predictive models to fully account for multiscale experimental observations. Proposed explanations for plastic instabilities in FCC alloys are discussed, including but not limited to classical DSA, with the aim to guide future experiments to elucidate the origins of serrated flow across length scales and improve key properties such as fatigue life.
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