An Investigation into the Role of Dislocation Climb During Intermediate Temperature Flow of Mg Alloys
An Investigation into the Role of Dislocation Climb During Intermediate Temperature Flow of Mg Alloys
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DOI：
10.1007/978-3-030-36647-6_19
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Ritzo;J. Bhattacharyya;R. Lebensohn;S. Agnew
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文献类型：
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作者：
M. Ritzo;J. Bhattacharyya;R. Lebensohn;S. Agnew
织构镁合金镁合金（镁合金）板材位错样品镁合金（镁合金）平行于横向进行拉伸试验，Zener-Hollomon参数值从室温和10−3s− 1时的Z ~ 50降至350 °C和10−5s−1时的Z ~ 18。在高Z下，样品表现出强烈的织构演化，织构演化表明位错的显著棱柱滑移与Burgers矢量。相应地，塑性各向异性高，r~ 4。在低Z时，织构演化最小，响应几乎是各向同性的，r~ 1。在低Z条件下观察到的塑性各向异性是由于非基底滑移模式的活动增强，包括位错的棱柱滑移和<c+a>位错的金字塔滑移。目前的研究结果对这种理解提出了质疑，并建议增强的延展性与位错的攀移更密切相关。
Textured Mg alloyMagnesium alloy (Mg alloy) sheetDislocation samplesMagnesium alloy (Mg alloy) were tensile tested parallel to the transverse direction, at Zener–Hollomon parameter values ranging fromZ~ 50 at room temperature and 10−3s−1down toZ~ 18 at 350 °C and 10−5s−1. At highZ, the samples exhibit strong texture evolutionTexture evolution indicative of significant prismatic slip of dislocations with Burgers vectors. Correspondingly, the plastic anisotropyPlastic anisotropy is high,r~ 4. At lowZ, the texture evolutionTexture evolution is minimal and the response is nearly isotropic,r~ 1. Previously, it has been asserted that the high ductility and low plastic anisotropyPlastic anisotropy observed at lowZconditions is due to enhanced activity of non-basal slip modes, including prismatic slip of dislocations and pyramidal slip of and <c+a> dislocations. The present results call this understanding into question and suggest that the enhanced ductility is more closely associated with the climbClimb of dislocations.