加载热循环对Mg_2B_2O_5w/AZ31B复合材料强度的影响

Effect of Stress-applied Thermal Cycling on Strength of Mg_2B_2O_5w/AZ31B Composites

对Mg2B2O5w/AZ31B复合材料不同循环条件下的试样进行了室温拉伸试验。结果表明,随循环最高温度的增加,该复合材料的抗拉强度先增大后减小,到达一定温度后又开始增大,最高循环温度对复合材料的影响要远大于循环区间温差ΔT;随循环次数增加,该复合材料的抗拉强度先增大后减小;AZ31B镁合金和Mg2B2O5w/AZ31B复合材料在80次加载热循环后抗拉强度都提高,但屈强比都下降,且复合材料的变化幅度较大。

The tensile test of Mg2B2O5w/AZ31B composites after stress-applied thermal cycles （TCs） in different conditions was conducted at room temperature （RT）. The results show that the tensile strength of the composites increases first and then decreases with the increase of the maximum cycle temperature Tmax, and increases again after a certain temperature. Tmax has more influences on tensile strength of the composite than AT, the temperature range of thermal cycle. The tensile strength of the composites increases first and then decreases with the increase of cycle times. After thermal cycles of 80 times, the tensile strength of both AZ31B magnesium alloy and Mg2B2O5w/AZ31B composites increases, but both yield ratios decline, and the composite changes more than AZ31B alloy.