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Hot deformation characteristics of as-cast and homogenized AZ61 Mg alloys under compression

机译：压缩状态下的铸态均质AZ61 Mg合金的热变形特性

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摘要

The hot deformation behaviors of AZ61 Mg alloys were investigated using compression tests in temperature and strain rate ranges of 523-673 K and 1 × 10~(-3) to 1 s~(-1), respectively. The specimens were deformed in the as-cast and homogenized states to evaluate differences in their responses to deformation. Optical microscopy analysis was performed to correlate microstructural changes to the flow behaviors. In comparison with homogenized specimens, the as-cast specimens exhibited a lower degree of dynamic recrystallization and/or smaller average grain size of the dynamically recrystallized grains under the same deformation conditions. These resulted in higher flow stresses in the as-cast specimens. The peak stress decreased with increasing deformation temperature and decreasing strain rate, which could be represented by a Zener-Hollomon parameter Z in the hyperbolic sine equation with the activation energy values of 181 and 151 kJ/mol for the as-cast and homogenized states, respectively. The higher activation energy observed in the as-cast state could be caused by the presence of the segregated Mg_(17)Al_(12) intermetallic particles.
机译：分别在523-673 K和1×10〜（-3）到1 s〜（-1）的温度和应变率范围内，通过压缩试验研究了AZ61镁合金的热变形行为。标本在铸态和均质状态下变形，以评估其对变形的响应差异。进行光学显微镜分析以使微观结构变化与流动行为相关。与均质试样相比，铸态试样在相同变形条件下表现出较低的动态再结晶程度和/或较小的平均动态晶粒尺寸。这些导致铸态试样中较高的流动应力。峰值应力随着变形温度的升高和应变速率的降低而降低，这可以用双曲正弦方程中的齐纳-所罗门参数Z表示，在铸态和均质态下活化能分别为181和151 kJ / mol，分别。在铸态下观察到较高的活化能可能是由于存在偏析的Mg_（17）Al_（12）金属间化合物引起的。

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