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首页> 外文会议>World Foundry Congress >The effect of temperature on the tensile strength of 20 vol short fiber (85 Al_2O_3 - 15 SiO_2) reinforced secondary S9G1GT6 aluminum alloy composite produced by indirect squeeze casting process
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The effect of temperature on the tensile strength of 20 vol short fiber (85 Al_2O_3 - 15 SiO_2) reinforced secondary S9G1GT6 aluminum alloy composite produced by indirect squeeze casting process

机译：温度对抗拉强度的20体积抗纤维（85％Al_2O_3-15％SiO_2）增强次级S9G1GT6铝合金复合材料的间接挤压铸造工艺产生的效果

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摘要

Secondary aluminum alloy S9C1GT6 (9%Si-1%Cu -0.35%Mg) matrix composite samples have been produced by infiltrating C.Itoh preforms of alumina-silica (85% Al_2O_3-15 % SiO2) discontinuous fiber by indirect Squeeze casting process after studying the solidification characteristics of the matrix alloy and optimizing the process parameters such as metal and die temperatures, metal injection speed, fiber preheat temperature and squeeze pressure. Evaluation of the tensile strength of the resulting composite at room and elevated temperatures in T6 condition has revealed 80% increase in tensile strength at 3000 C compared to the matrix alloy. Although the composite has shown an enhanced Young's modulus value of 95-100 GPa at room temperature than the matrix alloy (73 GPa), its tensile strength is lower. The lower strength of the composite at low temperature than the indirect squeeze cast matrix alloy is due to the high V_(CRIT). The high temperature tensile strength of the matrix alloy reduces the stress difference, σ_(um) - σ_m~*(a measure of the matrix alloy's work-hardening rate), which reduces V_(CRIT). Reduced V_(CRIT) at high temperature increases the amount of reinforcement and results in the observed transition from no to extensive reinforcement effectiveness at low and higher temperatures respectively.
机译：通过在间接挤压铸造过程中渗透氧化铝 - 二氧化硅（85％Al_2O_3-15％SiO 2）不连续纤维的C.ITOH预制件来制备二级铝合金S9C1GT6（9％Si-1％Cu -0.35％Mg）基质复合样品。研究基质合金的凝固特性，并优化金属和模具温度，金属注射速度，纤维预热温度和挤压压力的过程参数。与基质合金相比，在室温下，在室温下的抗拉强度的抗拉强度的抗拉强度揭示了3000℃的拉伸强度增加80％。虽然复合材料在室温下显得增强的杨氏模量值为95-100GPa，但其拉伸强度较低。在低温下比间接挤压铸造基质合金低的复合材料的较低强度是由于高V_（CRIT）。基质合金的高温拉伸强度降低了应力差，σ_（μm） - σ_m〜*（矩阵合金的工作 - 硬化率的量度），这减少了V_（CRIT）。在高温下减少V_（CRIT）增加了增强量，并导致观察到的过渡在低温和较高温度下不受广泛的增强效果。

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