Effect of deformation twins on damping capacity in extruded pure magnesium
Effect of deformation twins on damping capacity in extruded pure magnesium
复制标题
DOI：
10.1016/j.jallcom.2014.11.143
复制
发表时间：
2015-03
影响因子：
6.2
通讯作者：
H. Watanabe;Y. Sasakura;N. Ikeo;T. Mukai
中科院分区：
文献类型：
--
作者：
H. Watanabe;Y. Sasakura;N. Ikeo;T. Mukai
以弯曲振动衰减为特征的阻尼能力在挤压纯镁中进行了检查，以了解由预应变引入的预先存在的孪晶所发挥的作用。对于没有预应变的材料，阻尼能力由应变无关部分和应变相关部分组成，它们出现在临界应变以上。观察到的阻尼能力的临界应变对应于观察到的拉伸或压缩曲线的比例极限。对于在挤压方向预应变为-1%和-8%的材料，阻尼能力在低于比例极限的低应变下开始增加，并且高于没有预应变的情况。较高的阻尼能力被认为是由于先前存在的双胞胎的交替收缩和生长而发生的。
The damping capacity, which was characterized by bending vibration decay, was examined in extruded pure magnesium to understand the role played by pre-existing twins introduced by pre-strain. For materials without pre-strain, the damping capacity consisted of the strain-independent and the strain-dependent parts, which emerged above a critical strain. The critical strain observed for the damping capacity corresponded to the proportional limit observed for the tensile or compressive curves. For materials pre-strained to −1% and −8% in the extrusion direction, the damping capacity began to increase at low strains below the proportional limit and was higher than that without pre-strain. The higher damping capacity is thought to occur because of the alternate shrinkage and growth of pre-existing twins.