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应变速率敏感性指数m是表示超塑性的一个重要参数。本文在Hart关系式dlgP/dlgl=r-1-m的基础上,得出利用超塑拉伸时试样载荷P和试样长度l以测量m值的新计算式m=(lgP_1-lgP_2)/(lgl_2-lgl_1)-1。利用此式对Zn-Al共析类合金进行了实验并与其它测量m的方法作了测量结果比较,结果都是一致的。
Strain rate sensitivity index m is an important parameter that indicates superplasticity. Based on Hart’s relation dlgP / dlgl = r-1-m, a new formula m = (lgP_1-lgP_2) is obtained by using the sample load P and sample length l in superplastic stretching to measure m value. / (lgl_2-lgl_1) -1. The use of this type of Zn-Al eutectic alloy was tested with other methods of measuring the m made of the measurement results are compared, the results are the same.