共晶铝合金热膨胀系数的测定与回归分析
Regression Analysis and Measurement for the Coefficient of Thermal Expansion of Eutectic Al-base Alloys at Solidus
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摘要: 报道了能作储能材料用的11种共晶铝合金的平均线膨胀系数(ALCTE)的测定结果和真线性膨胀系数(RLCTE)的回归分析结果.每种合金的3个试样为1组.11组试样分别在H-90型膨胀仪中从室温加热到熔点,测定试样的伸长量.结果表明Al-32%Mg-6%Zn(原子数分数,下同)合金从28℃加热到448℃时,其ALCTE值为2.360×10-5℃-1,Al-15%Cu-9%Mg-0.04%Be合金从25℃加热到511℃时,其ALCTE值为1.881×10-5℃-1,分别是11种合金中最高和最低的.回归参数表明,从室温到熔点之间合金真膨胀系数的变化规律可用温度的三次多项式来描述.用回归分析的方法,研究了合金元素对膨胀系数的影响,建立了一个以温度和合金成份为自变量的膨胀系数回归函数.Abstract: This article reports the results of regression analysis on real linear coefficients of thermal expansion（RLCTE） and measurement of average linear coefficients of thermal expansion（ALCTE） of 11 type eutectic Al-bass alloys potentially used as energy storage materials.Three samples of each alloy are divided into one group.Samples of 11 groups are heated from room temperature to melting point,respectively,in H-90 type Dilatometer in order to measure the values of samples elongating.The results showed that both the ALCTE value of Al-32%Mg-6%Zn（atomic concentration） alloy heated from 28?℃to 448?℃and the one of Al-15%Cu-9%Mg-0.04%Be alloy heated from 25?℃to 511?℃ are the highest and the lowest among the 11 type alloys,respectively,2.360×10-5?℃-1 and 1.881×10-5?℃-1.The results of regression summary indicated that the change rule of RLCTE of alloys via temperature is able to be described using a multinomial of temperature cube in the range of room temperature to melting point.Meanwhile,the RLCTE as a function of temperature and composition is yielded after regressed on the effect of element on CTE of alloys.
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