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首页> 外文期刊>Journal of Materials Engineering and Performance >Strain Hardening and Strain-Rate Sensitivity of an Extruded Magnesium Alloy
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Strain Hardening and Strain-Rate Sensitivity of an Extruded Magnesium Alloy

机译：挤压镁合金的应变硬化和应变率敏感性

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摘要

The strain-hardening behavior and strain-rate sensitivity of an extruded AZ31B magnesium alloy were determined at different strain rates between 10{sup}(-2) and 10{sup}(-5) s{sup}(-1) in relation to the thickness of specimens (2.5 and 4.5 mm). Both the common approach and Lindholm's approach were used to evaluate the strain-rate sensitivity. The yield strength (YS) and the ultimate tensile strength (UTS) increased, the ductility decreased, and the brittle fracture characteristics increased with increasing strain rate. The thinner specimens exhibited a slightly higher UTS, lower ductility, higher strain-hardening exponent, and strain-hardening rate due to smaller grain sizes. The stage III strain-hardening rate linearly decreased with increasing true stress, but increased with increasing strain rate. In comparison to the common approach, the Lindholm's approach was observed to be more sensitive in characterizing the strain-rate sensitivity due to larger values obtained. The thinner specimens also exhibited higher strain-rate sensitivity. As the true strain increased, the strain-rate sensitivity decreased.
机译：分别在10 {sup}（-2）和10 {sup}（-5）s {sup}（-1）之间的不同应变率下确定了AZ31B镁合金挤压变形的应变硬化行为和应变速率敏感性到样品的厚度（2.5和4.5毫米）。常用方法和Lindholm方法都用于评估应变率敏感性。随着应变率的增加，屈服强度（YS）和极限抗拉强度（UTS）增加，延展性降低，脆性断裂特性增加。由于晶粒较小，较薄的试样显示出稍高的UTS，较低的延展性，较高的应变硬化指数和应变硬化速率。第三阶段的应变硬化率随着真实应力的增加而线性下降，但是随着应变率的增加而增加。与常规方法相比，由于获得了较大的值，因此观察到Lindholm方法在表征应变率灵敏度方面更为灵敏。较薄的样品还表现出较高的应变速率敏感性。随着真实应变的增加，应变率敏感性降低。

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