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首页> 外文期刊>Journal of Materials Engineering and Performance >Tensile and Fracture Toughness Properties of SiCp Reinforced Al Alloys: Effects of Particle Size, Particle Volume Fraction, and Matrix Strength
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Tensile and Fracture Toughness Properties of SiCp Reinforced Al Alloys: Effects of Particle Size, Particle Volume Fraction, and Matrix Strength

机译：SiCp增强铝合金的拉伸和断裂韧性特性：粒径，颗粒体积分数和基体强度的影响

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摘要

The goal of this work was to evaluate the effects of particle size, particle volume fraction, and matrix strength on the monotonic fracture properties of two different Al alloys, namely T1-A12124 and T1-A16061, reinforced with silicon carbide particles (SiC_p). From the tensile tests, an increase in particle volume fraction and/or matrix strength increased strength and decreased ductility. On the other hand, an increase in particle size reduced strength and increased the composite ductility. In fracture toughness tests, an increase in particle volume fraction reduced the toughness of the composites. An increase in matrix strength reduced both K_(crit) and delta_(crit) values. However, in terms of K_Q (5 percent) values, the A16061 composite showed a value similar to the corresponding A12124 composite. This was mainly attributed to premature yielding caused by the high ductility/low strength of the A16061 matrix and the testpiece dimensions. The effect of particle size on the fracture toughness depends on the type of matrix and toughness parameter used. In general, an increase in particle size decreased the K_Q(5 percent) value, but simultaneously increased the amount of plastic strain that the matrix is capable of accommodating, increasing both delta_(crit) and K_(crit) values.
机译：这项工作的目的是评估颗粒尺寸，颗粒体积分数和基体强度对两种不同的用碳化硅颗粒（SiC_p）增强的铝合金T1-A12124和T1-A16061的单调断裂性能的影响。通过拉伸试验，颗粒体积分数和/或基体强度的增加增加了强度并降低了延展性。另一方面，粒径的增加降低了强度并增加了复合材料的延展性。在断裂韧性测试中，颗粒体积分数的增加降低了复合材料的韧性。矩阵强度的增加会同时降低K_（crit）和delta_（crit）值。但是，就K_Q（5％）值而言，A16061复合材料显示的值类似于相应的A12124复合材料。这主要归因于A16061基体的高延展性/低强度和试件尺寸导致的过早屈服。粒度对断裂韧性的影响取决于基体的类型和所使用的韧性参数。通常，粒径的增加会降低K_Q（5％）值，但同时会增加基质能够容纳的塑性应变量，同时增加delta_（crit）和K_（crit）值。

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