The microstructure, mechanical properties and tensile deformation mechanism of rolled AlN/AZ91 composite sheets
The microstructure, mechanical properties and tensile deformation mechanism of rolled AlN/AZ91 composite sheets
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轧制AlN/AZ91复合材料板材的显微组织、力学性能及拉伸变形机制
DOI：
10.1016/j.msea.2019.138118
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发表时间：
2019-08
期刊：
影响因子：
6.4
通讯作者：
Liu Feng
中科院分区：
文献类型：
--
作者：
Zhang Bin;Yang Changlin;Sun Yunxia;Li Xinlin;Liu Feng
由于镁基复合材料塑性低、成形性差，对其轧制行为的研究较少。在本研究中，原位AlN/AZ91复合材料板材在400 °C下轧制，总厚度减薄率达80%。与其他轧制镁基复合材料相比，本研究轧制的AlN/AZ91复合材料板材具有良好的表面质量和更好的强塑性组合，有望在工业上推广应用。尽管完全再结晶的α-Mg颗粒表现出基本的轧制织构，但由于AlN陶瓷颗粒对基体织构的弱化作用，沿轧制方向和横向的力学性能没有显著差异。在轧制过程中，由于AlN陶瓷颗粒与AZ91基体之间的残余塑性应变，在AlN陶瓷颗粒周围形成了高密度的位错，促进了γ-Mg17Al12相的连续析出，从而在晶内获得了致密的纳米析出物。透射电子显微镜分析表明，原位AlN陶瓷颗粒在轧制过程中不起到裂纹源的作用，与镁基体有很强的界面结合，具有良好的轧制性能。强化机制分析表明，高强度增长主要归因于位错强化和析出强化。对于沿轧制方向和横向的拉伸轴，室温变形机制以锥面滑移为主，具有较高的塑性。
Due to the low ductility and poor formability, few studies were reported about the rolling behavior of magnesium matrix composites. In this study, in-situ AlN/AZ91 composite sheets were rolled at 400 °C with the total thickness reduction of 80 %. Compared with other rolled magnesium matrix composites, rolled AlN/AZ91 composite sheets in this study showed the good surface quality and better strength-ductility combination, which is expected to extend its application in industry. Although fully recrystallized α-Mg grains exhibited a basal rolling texture, there was no significant difference in mechanical properties along the rolling direction and transverse direction due to the weakening effect of AlN ceramic particles on the basal texture. During rolling, the high density of dislocations were formed around AlN ceramic particles owing to the residual plastic strain between AlN ceramic particles and AZ91 matrix, which promoted the continuous precipitation of γ-Mg17Al12phase, so densely distributed nano-precipitates were obtained in the interior of the grains. TEM analysis reveals in-situ AlN ceramic particles not acted as the cracking source during rolling, which had a strong interfacial bonding with magnesium matrix, contributing to the good rolling capacity. Strengthening mechanism analysis suggests the high strength increment was mainly attributed to the dislocation strengthening and precipitation strengthening. For tensile axis along rolling direction and transverse direction, the dominated deformation mechanism at room temperature was pyramidal plane slip, leading to a relative high ductility.
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