Enhanced microstructure homogeneity and mechanical properties of AZ91-SiC nanocomposites by cyclic closed-die forging
Enhanced microstructure homogeneity and mechanical properties of AZ91-SiC nanocomposites by cyclic closed-die forging
复制标题
通过循环闭式模锻增强 AZ91-SiC 纳米复合材料的微观结构均匀性和机械性能
DOI：
10.1177/0021998316651126
复制
发表时间：
2017-03-01
影响因子：
2.9
通讯作者：
Liao, Wen-Jun
中科院分区：
文献类型：
--
作者：
Guo, Wei;Wang, Qu-Dong;Liao, Wen-Jun
研究了AZ 91-SiC纳米复合材料的循环闭式模锻组织和力学性能。结果表明，经过5道次变形后，合金的晶粒尺寸明显细化，Mg 17 Al 12相和SiC纳米颗粒分布更加均匀，强度和延伸率显著提高。在循环闭式模锻过程中，由于基体流动剧烈，纳米颗粒团聚体通过捏合作用而解体，纳米SiC颗粒均匀分散在基体中。但由于纳米颗粒表面能较高，仍有少量的SiC团簇存在。复合材料的性能提高主要归因于Hall-Petch效应和Orowan强化。
The microstructure and mechanical properties of AZ91-SiC nanocomposites processed by cyclic closed-die forging were investigated. The results showed that much finer grain size and more homogeneous distribution of Mg17Al12 phase and SiC nanoparticles were obtained along with significant improvement in strength and elongation after five passes. During cyclic closed-die forging processing, the agglomeration of nanoparticles disintegrated through kneading effect induced by intense matrix flow, and the nano-sized SiC particles were dispersed uniformly into the matrix. However, a few SiC clusters still existed due to the high surface energy of nanoparticles. Properties enhancement of the composites was mainly attributed to Hall-Petch effect and Orowan strengthening.