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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Al–Ni intermetallic composites produced in situ by friction stir processing
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Al–Ni intermetallic composites produced in situ by friction stir processing

机译：通过搅拌摩擦原位制备的Al-Ni金属间化合物

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摘要

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_3Ni and Al_3Ni_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_3Ni particles. Typical microstructures of Al3Ni 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_3Ni_2 is surrounded. The grain refinement and the precipitation hardening effect of the Al3Ni 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.
机译：在铝合金板上用镍粉通过摩擦搅拌工艺（FSP）原位合成了块状的Al-Ni金属间化合物。分析了复合材料的微观结构和组成，测量了金属间化合物的硬度和拉伸性能。通过FSP和热处理成功地生产了具有Al_3Ni和Al_3Ni_2金属间化合物的无缺陷复合材料。 FSP之后，初始镍粉呈现三种状态：粗大的镍团聚，夹心结构复合物和微米级的Al_3Ni颗粒。热处理后的Al3Ni金属互化物的典型微观结构具有两种微观结构，即当细小的微米颗粒均匀地分布在铝基质中时为亚微米尺寸的等轴晶，而当Al_3Ni_2被包围时为柱状晶体。 Al3Ni金属间化合物的晶粒细化和沉淀硬化作用导致Al-Ni复合材料的显微硬度和拉伸强度显着提高。聚集的Ni粉在FSP过程中发生冶金反应。

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