Microstructure, texture and mechanical properties of extruded Mg-5Al-2Nd-0.2Mn alloy
Microstructure, texture and mechanical properties of extruded Mg-5Al-2Nd-0.2Mn alloy
复制标题
挤压Mg-5Al-2Nd-0.2Mn合金的显微组织、织构及力学性能
DOI：
10.1016/j.jallcom.2015.08.136
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发表时间：
2015-12-25
影响因子：
6.2
通讯作者：
Wang, Limin
中科院分区：
文献类型：
--
作者：
Wang, Jianli;Guo, Yongchun;Wang, Limin
研究了挤压Mg-5Al-2Nd-0.2Mn合金的显微组织、织构和力学性能。挤压后的合金表现出几乎完全再结晶的晶粒组织，平均晶粒尺寸约为20 mm。挤压过程中，金属间相Al11Nd3和Al2Nd破碎成小颗粒，同时析出少量Mg17Al12相，促进了动态再结晶过程中的晶粒细化。基底平面平行于板材的挤压方向，形成了较强的基底织构。挤压后合金的抗拉强度有明显提高，且挤压后合金在ED和TD方向上的抗拉强度差异不大。然而，在室温和150℃下，挤压合金的伸长率均高于挤压合金的伸长率，这是由于挤压合金中二次相沿拉伸方向分布，基底织构向拉伸方向倾斜所致。与铸态合金相比，挤压合金强度的显著提高是由于晶粒细化、Al-Nd金属间化合物的碎片化、AleNd金属间化合物与晶界的相互作用以及位错、固溶强化和织构强化的增加。(C) 2015 Elsevier B.V.版权所有
The microstructure, texture and mechanical properties of extruded Mg-5Al-2Nd-0.2Mn alloy were investigated in the present work. The extruded alloy demonstrated a near-completely recrystallized grain structure with average grain size of about 20 mm. Intermetallic phases Al11Nd3 and Al2Nd were fragmented to small particles and a small amount of Mg17Al12 phase was precipitated during extrusion, which promoted grain refinement during dynamic recrystallization. A strong basal texture was formed with the basal plane parallel to the extrusion direction (ED) of the plate. The tensile strength was obviously improved after extrusion, and the difference in tensile strength of the extruded alloy in ED and transverse direction (TD) was obscure. However, the elongation in ED was higher than that in TD at both room temperature and 150 degrees C. It was resulted from the distribution of secondary phases along ED and basal plane texture tilting toward ED in the extruded alloy. The significant improvement in strength of the extruded alloy, compared with that of the as-cast alloy, was due to the grain refinement, the fragment of Al-Nd intermetallics, the increased interaction between the AleNd intermetallics and grain boundaries as well as dislocations, solid solution strengthening and texture strengthening. (C) 2015 Elsevier B.V. All rights reserved.