Al-Ni intermetallic composites produced in situ by friction stir processing
Al-Ni intermetallic composites produced in situ by friction stir processing
复制标题
通过搅拌摩擦加工原位生产 Al-Ni 金属间复合材料
DOI：
10.1016/j.jallcom.2010.05.040
复制
发表时间：
2010-08-06
影响因子：
6.2
通讯作者：
Huang, Kehui
中科院分区：
文献类型：
--
作者：
Ke, Liming;Huang, Chunping;Huang, Kehui
采用搅拌摩擦工艺(FSP)在含Ni粉的铝合金平板上原位合成了块体Al-Ni金属间化合物。分析了复合材料的组织和成分，测试了金属间化合物的硬度和拉伸性能。通过FSP和热处理成功地制备了Al(3)Ni和Al(3)Ni(2)金属间化合物无缺陷复合材料。FSP处理后的原始镍粉呈现三种状态：粗大的镍团聚、夹层结构的复合和微米级的Al(3)Ni颗粒。Al(3)Ni金属间化合物热处理后的典型组织有两种组织，一种是细小的微米颗粒均匀分布在铝基中的亚微米等轴晶，另一种是被Al(3)Ni(2)包围的柱状晶。Al(3Ni)金属间化合物的细化和析出硬化作用显著提高了Al-Ni复合材料的显微硬度和拉伸强度。聚集态Ni粉在FSP过程中发生了冶金反应。(C)2010爱思唯尔B.V.保留所有权利。
Bulk Al-Ni intermetallic composites were synthesized in situ by Friction Stir Processing (FSP) at Al alloy plate with Ni powder. The microstructures and compositions of the composites were analyzed, the hardness and tensile properties of intermetallics were measured. Defect-free composites with Al(3)Ni and Al(3)Ni(2) intermetallics were successfully produced by FSP and heat treatment. The initial nickel powder present three states after FSP: the coarse nickel aggregation, the sandwich-structure composite and the micron-sized Al(3)Ni particles. Typical microstructures of Al(3)Ni intermetallics after heat treatment have two microstructures, i.e. the submicron-sized equiaxed crystal when there are fine micron particles uniformly distributed in the aluminum matrix and columnar crystal when Al(3)Ni(2) is surrounded. The grain refinement and the precipitation hardening effect of the Al(3)Ni intermetallics lead to a significant increase of the microhardness and tensile strength of the Al-Ni composites. The aggregated Ni powders have metallurgy reaction during FSP. (C) 2010 Elsevier B.V. All rights reserved.