Effect of texture on high temperature deformation behavior at high strain rates in a Mg–3Al–1Zn alloy
Effect of texture on high temperature deformation behavior at high strain rates in a Mg–3Al–1Zn alloy
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DOI：
10.1016/j.msea.2009.06.019
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发表时间：
2009-10
期刊：
影响因子：
6.4
通讯作者：
H. Watanabe;K. Ishikawa
中科院分区：
文献类型：
--
作者：
H. Watanabe;K. Ishikawa
在103 s − 1的高应变速率下，研究了具有101 <$0 mm纤维织构的挤压Mg-3Al-1 Zn合金棒材中试样取向或织构对高温变形行为的影响。沿两个样本方向（纵向和横向）获得单轴压缩测试数据。沿着两个样本方向（纵向和横向）。的屈服应力的温度依赖性是小的高达673 K的两个方向，表明扩散过程是不速率控制在这样一个高的应变速率。从室温到673 K，合金在103 s − 1处表现出很强的塑性各向异性。对于横向试样，屈服应力低于纵向试样。此外，塑性变形优先发生在挤压棒的径向方向上。这些结果表明，基底滑移是横向试样的主要变形机制。另一方面，强烈的温度不敏感性的流动应力，以及凹流动曲线中观察到的纵向标本建议的流行孪生。
The effect of specimen orientation, or texture on high temperature deformation behavior at a high strain rate of 103s−1was investigated in an extruded Mg–3Al–1Zn alloy rod with 〈101¯0〉 fiber texture. Uniaxial compression test data were obtained along two specimen directions (longitudinal and transverse directions). The temperature dependence of yield stress was small up to 673K for both directions, indicating that a diffusion process is not rate-controlling at such a high strain rate. The alloy exhibited strong plastic anisotropy at 103s−1from room temperature to 673K. For the transverse specimens, the yield stress was lower than that for the longitudinal specimens. In addition, plastic deformation occurred preferentially in the radial direction of the extruded rod. These results suggest that basal slip is the dominant deformation mechanism for the transverse specimens. On the other hand, strong temperature insensitivity of flow stress as well as concave flow curves observed in the longitudinal specimens suggested the prevalence of twinning.