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Superplastic Deformation Mechanism of a Zn-Al Eutectoid Alloy

机译：Zn-Al eutectoid合金的超塑性变形机理

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The deformation mechanism in the nanometer grain size range has been basically investigated from the results of microstructural observation after superplastic deformation in a Zn-Al eutectoid alloy in which a reverse grain size dependence of superplasticity was previously reported: flow stress increases and elongation decreases with decreasing grain size when grain size is markedly reduced to nanometer range. By controlling the aging condition after solution treatment and subsequent quenching, two specimens are prepared: the as-quenched specimen with ultrafine grains of 83nm in diameter and aged specimen with normally fine grains of 2.6μm. The elongation is confirmed to be smaller in the as-quenched specimen than in the aged specimen, although the flow stress is lower. As a result of TEM observation on the interior of the grains, dislocations are rare in the as-quenched specimen, while a significant density of dislocations are observed in the aged specimen. This result strongly supports the mechanism previously proposed by Mishra et al. that the accommodation process, i.e., the dislocation glide inside the grains, becomes more difficult with decreasing grain size in the nanometer grain size range, even though the grain boundary sliding as the major process becomes facilitated. Roughly assessed m-value was in accord with this mechanism.
机译：基本上研究了纳米晶粒尺寸范围内的变形机制，在Zn-Al共析合金中的超塑性变形后的微观变形后的结果，其中先前报道了超塑性的逆晶粒尺寸依赖性：流量应力增加，随着伸长的伸长减少而降低晶粒尺寸明显减少到纳米范围时晶粒尺寸。通过控制溶液处理后的老化条件和随后的淬火后，制备了两种样品：具有83nm的超细晶粒的淬灭样标本和常见的颗粒为2.6μm的老晶试样。尽管流量应力较低，但确认伸长率在淬火标本中比在老化的样本中更小。由于对晶粒内部的TEM观察，在淬火标本中罕见的脱位，而在老化的样本中观察到显着的位错密度。这结果强烈支持Mishra等人之前提出的机制。即使纳米粒度范围内的颗粒尺寸降低，容纳过程，即，谷物内部的位错滑动变得更加困难，即使作为主要过程的晶界滑动，颗粒尺寸范围的晶粒尺寸降低。粗略评估的m价值符合这种机制。

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