Creep Deformation Mechanisms in Coarse-Grained Solid Solution Mg Alloys
Creep Deformation Mechanisms in Coarse-Grained Solid Solution Mg Alloys
复制标题
粗晶固溶镁合金的蠕变变形机制
DOI：
10.2320/matertrans.45.1266
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发表时间：
2004
影响因子：
1.2
通讯作者：
K. Higashi
中科院分区：
文献类型：
--
作者：
S. Chung;H. Watanabe;W. Kim;K. Higashi
研究了粗晶镁铝基固溶体合金（AZ 31）在573 ~ 673 K温度范围内、应变速率为2 ~ 10 ~ 5 ~ 7 ~ 10 ~ 2 s ~ 1的宽应变速率范围内的蠕变变形行为。随着应力的增加，流变速率的控制过程依次为粘性滑移控制蠕变（VGC）、位错攀移蠕变（DCC）和幂律破坏（PLB）。通过对Mg-Al和MgAl-Zn合金的研究，证实了Mg和Mg合金的VGC和DCC蠕变机制。此外，本文还应用DCC和VGC理论对镁及镁合金的蠕变机理进行了解析解释。通过实验结果与理论分析的比较，对镁合金中的相变进行了分析。分析了合金化对蠕变强度和变形机制转变的影响。
Creep deformation behavior of coarse-grained Mg-Al based solid solution alloy (AZ31) was studied in a wide strain rate range of 2 � 10� 5� 7 � 10� 2 s� 1 at temperature range of 573� 673 K. Viscous glide controlled creep (VGC), dislocation climb creep (DCC) and power law breakdown (PLB) showed up in order with increasing stress as the flow rate-controlling process. From the former results for Mg-Al and MgAl-Zn alloys, the creep mechanisms of VGC and DCC in Mg and Mg alloys are confirmed. Moreover, several theories presented for DCC and VGC are applied to convey the creep mechanisms in Mg and Mg alloys by analytical way. Transitions in Mg alloys are analyzed also by comparing experimental results and theories. Alloying effects on creep strength and transitions of deformation mechanism are analyzed.