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The effect of SiC nanoparticles on the friction stir processing of severely deformed aluminum

机译：SiC纳米颗粒对严重变形铝摩擦搅拌过程的影响

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摘要

The 1050 aluminum sheets are severely deformed by two passes of the constrained groove pressing (CGP) process to obtain the strain of 2.32. Friction stir processing (FSP) is then performed on these specimens at two conditions of with and without SiC nanoparticles. Microhardness measurements indicate that in the state of FSP without any particle, the microhardness of stir zone is decreased due to the recrystallization and grain growth occurrence because of high stored strain energy in the CGPed specimens. In order to enhance the mechanical properties of the stir zone, SiC nanoparticles are used during FSP. Also, the effect of FSP pass number on the distribution of nanoparticles is investigated. Microstructure investigations reveal that after 1 and 2 passes of FSP with SiC nanoparticles, specimens experience brittle fracture at the retreating side of the stir zone during transverse tensile test due to the presence of clustered nanoparticles in this region. However, it is found that after 3 passes of FSP, SiC nanoparticles are uniformly distributed leading to the prohibition of grain growth in the stir zone. This can be responsible for the improvement of stir zone microhardness by about 118.8% with respect to the specimen FSPed without nanoparticles.
机译：1050铝板在两次约束槽压制（CGP）过程中均发生了严重变形，从而获得了2.32的应变。然后在有和没有SiC纳米颗粒的两个条件下对这些样品进行摩擦搅拌处理（FSP）。显微硬度测量表明，在没有任何颗粒的FSP状态下，搅拌区的显微硬度由于CGP试样中的高存储应变能而由于重结晶和晶粒长大而降低。为了增强搅拌区的机械性能，在FSP期间使用了SiC纳米颗粒。此外，研究了FSP通过次数对纳米颗粒分布的影响。微观结构研究表明，在经过FSP和SiC纳米颗粒的第1次和第2次通过后，由于在该区域中存在簇状纳米颗粒，因此在横向拉伸试验期间，样品在搅拌区的后退侧经历了脆性断裂。然而，发现在FSP经过3次之后，SiC纳米颗粒均匀地分布，从而导致在搅拌区域中晶粒的生长被禁止。相对于没有纳米颗粒的FSPed，这可以使搅拌区的显微硬度提高约118.8％。

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