The Influence of Alternating Low-Cycle Bending Loads on Sheet Properties Having an Hcp Crystal Lattice
The Influence of Alternating Low-Cycle Bending Loads on Sheet Properties Having an Hcp Crystal Lattice
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DOI：
10.1007/s11665-018-3123-2
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发表时间：
2018-01
影响因子：
2.3
通讯作者：
E. Demler;D. Rodman;M. Rodman;G. Gerstein;O. Grydin;A. A. Briukhanov-A.;C. Klose;F. Nürnberger;H. Maier
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文献类型：
--
作者：
E. Demler;D. Rodman;M. Rodman;G. Gerstein;O. Grydin;A. A. Briukhanov-A.;C. Klose;F. Nürnberger;H. Maier
研究了AZ31镁合金和α-钛的循环弯曲过程。这些材料具有不同c/a比的hcp晶格。结果表明，后者对板材的变形行为有较大的影响。即使是很小的变形（高达2%的应变），对两种材料的屈服应力都有很大的影响。此外，循环弯曲还促进了棱柱滑移的激活，棱柱滑移伴随着孪晶和去孪晶。利用织构测量确定了循环弯曲后板材各向异性的变化。特别是，随着弯曲次数的增加，AZ31合金板的力学性能的各向异性发生了相当大的变化。屈服应力的各向异性从初始条件下的15%增加到3次循环后的40%。对于α-钛片，各向异性的变化近似于。少26%。一般来说，在第一次弯曲循环中，性能发生了最大的变化，并且在进一步的循环中发生了稳定。
The process of cyclic bending was investigated using thin sheets of the magnesium alloy AZ31 and α-titanium. These materials possess an hcp crystal lattice with different c/a ratios. It turned out that the latter have a substantial influence on the sheet deformation behavior. Even for small deformations (up to 2% strain), a large influence on the yield stress was present for both materials. In addition, cyclic bending contributes to the activation of prismatic slip, which is accompanied by twinning and detwinning. The changes in sheet anisotropy following cyclic bending were determined using texture measurements. Specifically, the AZ31 alloy sheets exhibited a considerable change in anisotropy of the mechanical properties with an increasing number of bending cycles. The anisotropy in the yield stress increases from 15% in the initial condition to 40% after three cycles. For the α-titanium sheet, the change in anisotropy was approx. 26% less. In general, the largest changes in properties occurred already in the first bending cycle and a stabilization took place upon further cycling.