Microstructure evolution and mechanical properties of friction stir processed TiC/7085Al nanocomposites
Microstructure evolution and mechanical properties of friction stir processed TiC/7085Al nanocomposites
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搅拌摩擦处理TiC/7085Al纳米复合材料的组织演变及力学性能
DOI：
10.1088/2053-1591/ab7c22
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发表时间：
2020-03
影响因子：
2.3
通讯作者：
Dongshuai Zhou;Jian Wang;Yalin Lu;Z. Bai
中科院分区：
文献类型：
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作者：
Dongshuai Zhou;Jian Wang;Yalin Lu;Z. Bai
本文采用搅拌摩擦法制备了不同转速下原位生成的0.5wt.%TiC/7085Al纳米复合材料，获得了均匀分散的TiC纳米颗粒和细晶复合材料。研究了转速对组织和拉伸性能的影响。实验结果表明，搅拌区(SZ)具有细小的等轴晶和高比例的高角度晶界(HAGBs)，这是由动态再结晶(DRX)引起的。此外，搅拌摩擦成型(FSPed)复合材料的拉伸强度和延伸率较基础复合材料有显著提高。当转速为1000rpm时，复合材料的晶粒度最小，力学性能最好。平均晶粒度减小到1.61μm，屈服强度、极限拉伸强度和延伸率分别达到345 Mpa、429 Mpa和17.8%。
In this paper, homogeneously dispersed TiC nanoparticles and fine-grained composite was successfully achieved by friction stir processing (FSP) of in situ 0.5 wt.% TiC/7085Al nanocomposites with different rotational speed. The effects of the rotational speed on the microstructures and tensile properties were investigated. Experimental results showed that the stir zone (SZ) exhibited equiaxed recrystallized grains with fine size and a high fraction of high-angle grain boundaries (HAGBs) caused by dynamic recrystallization (DRX). Moreover, the tensile strength and elongation of the friction stir processed (FSPed) composite were significantly improved compared with the base composite. With the rotational speed of 1000 rpm, the composite has the smallest grain size and the optimum mechanical properties. The average grain size decreased to 1.61 μm, the yield strength (YS), ultimate tensile strength (UTS) and elongation reached to 345 MPa, 429 MPa and 17.8%, respectively.