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首页> 外文会议>2006 BIMW >Effect of silicon addition and thermal history on the thermal expansion behavior of SiC/Al composites
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Effect of silicon addition and thermal history on the thermal expansion behavior of SiC/Al composites

机译：硅添加量和热历史对SiC / Al复合材料热膨胀行为的影响

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Two Al-Si alloys (Al-12Si and Al-20Si) and an industrial pure Al were reinforced with 70vol.% dual-sized SiC particles. The composites experienced annealing treatment, to investigate the effect of silicon addition and thermal history on the thermal expansion behavior of high SiC content aluminum matrix composites. The results showed that silicon additions led to a beneficial reduction in the coefficients of thermal expansion (CTEs) of the composites. In the temperature range between 20°C and 400°C, a continuous increase in CTEs with temperature was observed for SiCp/pure Al composite. However, the CTEs of SiCp/Al-12Si and SiCp/Al-20Si showed the maxima at 350°C and 250°C respectively, then diminished at higher temperatures. This was related to the change of solid solubility of silicon in aluminum at elevated temperatures. The thermal expansion behavior of SiCp/Al composites was also influenced by thermal history. After annealing treatment, the CTEs were reduced when compared with those of as-cast composites. Annealing treatment reduced the original thermal residual stresses, and then altered thermal expansion behavior of the composites.
机译：两种Al-Si合金（Al-12Si和Al-20Si）和一种工业纯Al均用70vol。％的SiC双重颗粒增强。该复合材料经过退火处理，以研究硅的添加和热历史对高SiC含量铝基复合材料热膨胀行为的影响。结果表明，添加硅可有效降低复合材料的热膨胀系数（CTE）。在20°C至400°C的温度范围内，对于SiCp /纯Al复合材料，观察到CTE随温度连续升高。然而，SiCp / Al-12Si和SiCp / Al-20Si的CTE分别在350°C和250°C时显示出最大值，然后在更高的温度下减小。这与高温下硅在铝中的固溶度变化有关。 SiCp / Al复合材料的热膨胀行为也受热历史的影响。退火处理后，与铸态复合材料相比，CTE降低了。退火处理降低了原始的热残余应力，然后改变了复合材料的热膨胀性能。

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