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Effect of Processing Speed on Microstructures and Mechanical Properties of Submerged Friction Stir Processed AZ91 Alloy

机译：加工速度对淹没搅拌AZ91合金组织和力学性能的影响

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摘要

Normal and submerged friction stir processing (SFSP) were conducted to AZ91 magnesium alloy plates with 6mm in thickness,and influence of processing speed (ν) on microstructures and mechanical properties of the experimental materials was investigated.The results revealed that fine and equiaxed grains were observed in the stirred zone (SZ).As the processing speed increased from 60mm/min to 150mm/min,the average grain size in the SZ of normal FSP material decreased.However,the grain size of the SFSP specimens first increased with the processing rate increasing from 60mm/min to 120mm/min,and then decreased when the processing rate increased to 150mm/min.Microstructure of the SFSP specimen was much finer compared with the normal FSP one,and the grain size of ?-Mg was about 1.2μm when the processing speed was 60mm/min during SFSP.Because of much finer microstructure of SFSP,the microhardness,tensile strength and elongation were all improved.SEM fracture observation showed that fine dimples and tearing edges could be observed on SFSP specimen which showing good ductility.In addition,high temperature tensile tests showed that SFSP AZ91 alloys exhibited excellent superplasticity at high strain rate,with an elongation of 1202％ at 623 K with a strain rate of 3x10-3s-1.The present study demonstrated that SFSP possesses great potential in preparing fine-grained materials.
机译：对厚度为6mm的AZ91镁合金板进行了普通和浸没式搅拌摩擦加工（SFSP），研究了加工速度（ν）对实验材料的组织和力学性能的影响。随着加工速度从60mm / min增加到150mm / min，普通FSP材料的SZ的平均晶粒尺寸减小，但是SFSP试样的晶粒尺寸首先随着加工而增加速率从60mm / min增加到120mm / min，然后随着加工速率增加到150mm / min而减小。SFSP试样的显微组织比普通的FSP细得多，α-Mg的晶粒尺寸约为1.2 SFSP加工速度为60mm / min时为μm。由于SFSP的微观结构细微得多，因此显微硬度，抗拉强度和伸长率均得到改善。高温拉伸试验表明，SFSP AZ91合金在高应变速率下表现出优异的超塑性，在623 K下伸长率为1202％，应变速率为3x10-。 3s-1。本研究表明SFSP在制备细粒材料方面具有巨大潜力。

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