等通道转角挤压制备超细晶材料的研究与发展

发布时间：2018-02-06 00:01

本文关键词： 大塑性变形超细晶材料等通道转角挤压细化机理　出处：《材料导报》2017年01期 　论文类型：期刊论文

【摘要】：等通道转角挤压(Equal channel angular pressing,ECAP)是大塑性变形制备超细晶材料的方法之一,具有大晶粒尺寸的材料可以在室温下挤压达到超细晶尺度。从ECAP模具参数、工艺条件影响因素、模具及制备方法改进、细化机理、制备的超细晶材料组织稳定性及性能方面进行总结,并结合部分研究结果可知,ECAP模具正在不断被优化和改进,复合挤压技术不断出现,目前已实现超细晶材料的连续ECAP挤压制备技术。等通道转角挤压的晶粒细化主要是由于剪切力的作用和第二相粒子的作用,ECAP晶粒细化机理及组合工艺的研究是目前研究的热点。超细晶材料在不同领域的应用对其性能提出的更高要求,对其大塑性变形制备技术本身也是挑战。
[Abstract]:Equal channel angular pressing (ECAP) is one of the methods for preparing ultrafine grained materials by large plastic deformation. The material with large grain size can be extruded to ultrafine grain size at room temperature. According to the parameters of ECAP mould, the influencing factors of process conditions, the improvement of mould and preparation method, and the refinement mechanism. The microstructure stability and properties of the ultrafine grained materials were summarized and some results showed that the ECAP mould was being optimized and improved and the composite extrusion technology was emerging. At present, continuous ECAP extrusion technology has been realized for ultrafine grained materials. The grain refinement of equal channel angular extrusion is mainly due to the effect of shearing force and the effect of the second phase particles. The research on grain refinement mechanism and combination process of ECAP is a hot topic at present. The application of ultrafine crystal materials in different fields requires higher performance, which is also a challenge to the preparation technology of large plastic deformation.
【作者单位】：昆明理工大学材料科学与工程学院;昆明理工大学分析测试研究中心;
【基金】：国家自然科学基金(51564032) 云南省分析测试中心基金(2016M20152230080)
【分类号】：TG376

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