搅拌摩擦加工制备的AA1100/17-4 PH不锈钢复合材料的显微组织、元素、力学和结构特性

Q2 Materials Science

Engineering Solid Mechanics Pub Date : 2021-01-01 DOI:10.5267/j.esm.2021.6.002

Tawanda Marazani, E. Akinlabi, D. Madyira, J. Majumdar, Surjya K. Pal

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引用次数: 0

摘要

采用肩径为21 mm、销径为7 mm、销高为5 mm的H13工具钢圆柱螺纹销，研制了一种100%重叠双道搅拌摩擦工艺制备AA1100/17-4 PH不锈钢复合材料。在6mm厚的AA1100板上加工2mm宽，3.5 mm深的凹槽，其中17-4 PH不锈钢粉末使用无针工具包装和压实。在转速分别为2100、2450和2800 rpm、行程速度为20 mm/min、倾角为2.5°、搅拌深度为0.2 mm的条件下，进行摩擦搅拌处理。采用x射线衍射对其进行了显微组织、元素组成、拉伸测试、显微硬度和结构分析。从所采用的所有工艺参数中获得了机械和冶金连接良好的无缺陷显微照片。然而，在2450和2800 rpm时，增强剂的团聚现象变得明显。在2100转/分时，增强筋均匀分布。元素分析证实了基体与增强剂的共混。在2450转/分下，获得了高达母材4倍的SZ硬度，以及高达97.29%的接头效率的极限拉伸性能。然而，由于增强剂诱发的硬度，制备样品的伸长率下降了约10%。尽管如此，这些材料仍然保持了优异的机械性能。所有x射线衍射图均有5个不同相位和晶面的强峰。然而，在39°2θ范围内，所有衍射图都有一个Al - syn(111)晶体平面。晶粒尺寸小至4 nm，获得了超细晶粒，而观察到的高位错密度和微应变表明制备的AA1100/17-4 PH不锈钢复合材料具有高强度。

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Microstructural, elemental, mechanical and structural attributes of AA1100/17-4 PH stainless steel composites fabricated via friction stir processing

A 100% overlap double pass friction stir process technique was developed for the fabrication of AA1100/17-4 PH stainless steel composites, using an H13 tool steel cylindrical threaded pin with shoulder diameter of 21 mm, pin diameter of 7 mm and pin height of 5 mm. Grooves of 2 mm width and 3.5 mm depth were machined on the 6 mm thick AA1100 plate, where the 17-4 PH stainless steel powder was packed and compacted using a pinless tool. Friction stir processing was conducted at rotational speeds of 2100, 2450 and 2800 rpm, while the travel speed of 20 mm/min, tilt angle of 2.5° and plunge depth of 0.2 mm, were kept constant. Investigations were carried out on the microstructure, elemental composition, and tensile testing and microhardness as well as structural analysis using X-ray diffraction. Defect-free micrographs with good mechanical and metallurgical connections were obtained from all the employed process parameters. However, agglomeration of reinforcements became noticeable at 2450 and 2800 rpm. Uniform distribution of reinforcements were observed at 2100 rpm. Elemental analysis confirmed matrix and reinforcements blending and mixing. Superior SZ hardness of as high as 4 times that of the base metal were achieved, while ultimate tensile strength properties with joint efficiencies as high as 97.29% were attained at 2450 rpm. However, the percentage elongation of the fabricated samples dropped by around 10% due to the reinforcements-induced hardness. Nonetheless, the fabrications retained superior mechanical properties. All the X-ray diffractograms had 5 intense peaks with different phases and crystal planes. However, an Al syn (111) crystal plane was common to all diffractograms at around 39° 2θ range. The obtained crystallite sizes of as small as 4 nm revealed the attainment of ultrafine grains, while the observed high dislocation densities and micro strains gave an indication that the fabricated AA1100/17-4 PH stainless steel composite is of high strength.

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来源期刊

Engineering Solid Mechanics Materials Science-Metals and Alloys

CiteScore

3.00

自引率

0.00%

发文量

期刊介绍： Engineering Solid Mechanics (ESM) is an online international journal for publishing high quality peer reviewed papers in the field of theoretical and applied solid mechanics. The primary focus is to exchange ideas about investigating behavior and properties of engineering materials (such as metals, composites, ceramics, polymers, FGMs, rocks and concretes, asphalt mixtures, bio and nano materials) and their mechanical characterization (including strength and deformation behavior, fatigue and fracture, stress measurements, etc.) through experimental, theoretical and numerical research studies. Researchers and practitioners (from deferent areas such as mechanical and manufacturing, aerospace, railway, bio-mechanics, civil and mining, materials and metallurgy, oil, gas and petroleum industries, pipeline, marine and offshore sectors) are encouraged to submit their original, unpublished contributions.