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Strength-ductility balance strategy in SiC reinforced aluminum matrix composites via deformation-driven metallurgy
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-09-24 , DOI: 10.1016/j.jallcom.2021.162078
Dongxin Mao 1 , Xiangchen Meng 1 , Yuming Xie 1 , Yuchen Yang 2 , Yanli Xu 2 , Zhiwei Qin 1 , Yuexin Chang 1 , Long Wan 1 , Yongxian Huang 1
Affiliation  

The strategy of the strength-ductility balance of aluminum matrix composites (AMCs) reinforced with nano- and micro-SiC particles via deformation-driven metallurgy was designed. The grain refinement of SiCnp/AMCs was promoted with the nano-SiC particles intragranularly-dispersed, and the stability of the ultra-fine-grains was improved due to the Zener pinning mechanism. The ultimate tensile strength of the SiCnp/AMCs was increased significantly, reaching 435 MPa and kept the ductility at 9%. A typical multimodal grain microstructure of SiCμp/AMCs was obtained with micro-sized grains and ultrafine grains as the localized grain refinement was promoted by the particle stimulated nucleation mechanism and was intensified by the broken micro-SiC particles. The ductility of the SiCμp/AMCs was kept well, reaching 18%, and kept the ultimate tensile strength at 200 MPa. Therefore, the microstructure of SiC/AMCs could be designed to balance the strength and ductility via optimizing the SiC particles according to the needs of practical applications: matrix strength could be increased by selecting a certain amount of nano-SiC particles; while an excellent ductility could be obtained by adding the appropriate amount of micro-SiC particles.



中文翻译:

通过变形驱动冶金在 SiC 增强铝基复合材料中的强度-延展性平衡策略

设计了纳米和微米 SiC 颗粒通过变形驱动冶金增强铝基复合材料 (AMCs) 的强度-延展性平衡策略。纳米SiC颗粒在晶内分散促进了SiC np /AMCs的晶粒细化,齐纳钉扎机制提高了超细晶粒的稳定性。SiC np /AMCs的极限拉伸强度显着提高,达到 435  MPa,延展性保持在 9%。SiC μp 的典型多峰晶粒显微组织由于颗粒刺激成核机制促进了局部晶粒细化,并通过破碎的微 SiC 颗粒强化了局部晶粒细化,因此获得了具有微尺寸和超细晶粒的 /AMCs。SiC μp / AMCs的延展性保持良好,达到 18%,极限拉伸强度保持在 200  MPa。因此,可以根据实际应用的需要,通过优化SiC颗粒来设计SiC/AMCs的微观结构以平衡强度和延展性:选择一定量的纳米SiC颗粒可以提高基体强度;同时加入适量的微碳化硅颗粒可以获得优异的延展性。

更新日期:2021-09-24
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