深冷处理对SiC<sub>p</sub>/A356复合材料力学性能的影响

崔光华; 欧阳求保; 顾海麟; 张荻; 张国定

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深冷处理对SiC_p/A356复合材料力学性能的影响
Effects of Cryogenic Treatment on Mechanical Properties of SiCp/A356 Composites
2009年29卷第7期页码：647-649
纸质出版日期： 2009 ，
DOI：

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[1]崔光华,欧阳求保,顾海麟,张荻,张国定.深冷处理对SiC_p/A356复合材料力学性能的影响[J].特种铸造及有色合金,2009,29(07):647-649+585-586.

Cui Guanghua1, Ouyang Qiubao1, Gu Hailin2, et al. Effects of Cryogenic Treatment on Mechanical Properties of SiCp/A356 Composites[J]. Special Casting & Nonferrous Alloys, 2009,29(7):647-649.
[1]崔光华,欧阳求保,顾海麟,张荻,张国定.深冷处理对SiC_p/A356复合材料力学性能的影响[J].特种铸造及有色合金,2009,29(07):647-649+585-586. DOI：

Cui Guanghua1, Ouyang Qiubao1, Gu Hailin2, et al. Effects of Cryogenic Treatment on Mechanical Properties of SiCp/A356 Composites[J]. Special Casting & Nonferrous Alloys, 2009,29(7):647-649. DOI：

摘要

采用熔铸搅拌法制备了SiCp质量分数为38%的A356铝基复合材料

研究了深冷处理和深冷处理循环次数对铝基复合材料力学性能的影响。试验表明

深冷处理使铝基复合材料的屈服强度和抗拉强度提高了约10%

深冷处理循环次数对力学性能影响不大。对复合材料的微观形貌观察和EDAX分析表明

在深冷过程中有Si相和其他超微第二相的析出

观察了扫描断口

发现增强相在断裂过程中产生了规则的解理面

复合材料的断裂主要是增强相的解理断裂和基体的撕裂。

Abstract

Effects of cryogenic treatment and its cycles on mechanical properties of the 38%SiCp/A356 MMCs （metal matrix composites） which was prepared by stirring-casting method were tested. The results reveal that yield strength and tensile strength of the MMCs are improved by approximately 10% after cryogenic treatment

however

the distinct effects of cycles on mechanical properties can not be observed. Microstructural observation and the EDAX analysis show that the precipitation of Si phase and other super-micro-second phase can be observed in process of cryogenic treatment. Fracture morphology shows that the fracture mechanism of the MMCs is characterized by cleavage crack of SiCp coupled with tearing of matrix due to the occurrence of regular cleavage face in process of crack.