Cyclic deformation behaviour and lifetime calculation of the magnesium die-cast alloys AZ91D, MRI 153M and MRI 230D
Cyclic deformation behaviour and lifetime calculation of the magnesium die-cast alloys AZ91D, MRI 153M and MRI 230D
复制标题
镁压铸合金 AZ91D、MRI 153M 和 MRI 230D 的循环变形行为和寿命计算
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Eifler
中科院分区：
文献类型：
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作者：
Barbara Ebel;F. Walther;D. Eifler
摘要采用压铸法制备了镁合金AZ 91 D、MRI 153 M和MRI 230 D的压铸试样，并对其进行了铸造蒙皮试验。细晶组织由枝晶状镁固溶体和枝晶间析出物组成。通过机械应力-应变滞后和温度测量，在应力控制载荷增加和单步测试中表征了循环变形行为。载荷增加试验允许可靠的短时间疲劳极限估计。采用物理寿命计算方法PHYBAL，通过三次循环塑性变形实验，根据塑性应变幅值和试样温度变化，精确计算镁合金的寿命。根据“PHYBAL”计算的寿命与实验测定的数据非常吻合。
Abstract The magnesium alloys AZ91D, MRI 153M and MRI 230D were investigated in the form of die-cast specimens with a cast-skin. The fine-grained microstructure consists of a dendritic magnesium solid solution and interdentritic precipitates. The cyclic deformation behaviour was characterised in stress-controlled load increase and single step tests by means of mechanical stress – strain hysteresis and temperature measurements. Load increase tests allow a reliable short-time estimation of the endurance limit. With the physically based lifetime calculation method “PHYBAL”, the lifetime of the magnesium alloys can be precisely calculated on the basis of the plastic strain amplitude and the change of the specimen temperature due to cyclic plastic deformation with three experiments. Lifetimes calculated according to “PHYBAL” agree excellently with experimentally determined data.