hole-size elongation 井眼变形
They also show that a finer grain size can be obtained by dynamic recrystallization during superplastic deformation at a high strain rate, but the total elongation to failure is limited in about 135%.
合金在高应变速率的变形中通过动态再结晶可获得更细的晶粒尺寸，其断裂时总延伸率在135%左右。
The relation between elongation and temperature, the pitch content, the distribution of particle size was investigated.
研究延伸率与阳极糊配料中沥青含量、粉料含量与其实验温度等的关系。
The results show the tensile strength, yield strength, hardness and elongation increased obviously due to the decreasing of the grain size of pure Cu after severe plastic deformation.
研究结果表明：经过大变形后，由于纯铜的晶粒得以细化，抗拉强度、屈服强度、硬度和断裂延伸率都显著增加。
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