Grain growth and texture evolution during annealing in an indirect-extruded Mg-1Gd alloy
Grain growth and texture evolution during annealing in an indirect-extruded Mg-1Gd alloy
复制标题
间接挤压 Mg-1Gd 合金退火过程中的晶粒生长和织构演变
DOI：
10.1016/j.jallcom.2013.09.028
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发表时间：
2014-02-05
影响因子：
6.2
通讯作者：
Dong, J.
中科院分区：
文献类型：
--
作者：
Wu, W. X.;Jin, L.;Dong, J.
稀土织构成分可以改善含稀土镁合金的成形性和延展性。研究了Mg-1Gd合金经间接挤压淬火后退火过程中的晶粒生长和织构演变，揭示稀土织构成分的形成机制。在挤压态Mg-1Gd样品中，再结晶晶粒和大伸长晶粒的取向均以平行于挤压方向（ED）的< 10 (1)> bar0 >取向为主。在再结晶退火过程中，观察到< 2 (1)> bar(1) > bar1 >晶粒优先生长，其< 2 (1)> bar(1) > bar1 >取向平行于ED，导致< 2 (1)> bar(1) > bar1 > re织构成分随着退火温度的升高而逐渐增强，而< 10 (1)> bar0 >成分则逐渐减弱。晶粒优先生长的驱动力是< 2 (1)/ bar(1) / bar1 >晶粒与< 10 (1)/ bar0 >晶粒之间的储能差异。在长时间退火过程中，< 10 (1)> bar0 >晶粒的异常生长导致< 10 (1)> bar0 >组份织构的强化，这可以用织构效应来解释。(C) 2013 Elsevier B.V.版权所有
RE (rare earth)-texture component has been reported to be responsible for improved formability and ductility in RE-containing Mg alloys. Grain growth and texture evolution during annealing of Mg-1Gd alloy was investigated after indirect extrusion and quenching to reveal the formation mechanisms of the RE texture component. In the as-extruded Mg-1Gd sample, both the recrystallized grains and large elongated grainsare oriented mainly with < 10 (1) over bar0 > orientation parallel to the extrusion direction (ED). The preferred growth of the < 2 (1) over bar(1) over bar1 > grain with its < 2 (1) over bar(1) over bar1 > orientation parallel to ED has been observed during recrystallization annealing, leading to the gradual strengthening of < 2 (1) over bar(1) over bar1 > RE-texture component at the expense of the < 10 (1) over bar0 > component with increasing annealing temperature. The driving force for the preferred grain growth is the difference in stored energy between the < 2 (1) over bar(1) over bar1 > grains and the < 10 (1) over bar0 > grains. Abnormal growth of the < 10 (1) over bar0 > grain takes place during long-time annealing, resulting in the strengthening of < 10 (1) over bar0 > component texture, which can be explained by a texture effect. (C) 2013 Elsevier B.V. All rights reserved.