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首页> 外文期刊>Materials Science and Engineering >Texture variations and mechanical properties of aluminum during severe plastic deformation and friction stir processing with SiC nanoparticles
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Texture variations and mechanical properties of aluminum during severe plastic deformation and friction stir processing with SiC nanoparticles

机译：SiC纳米颗粒在剧烈塑性变形和摩擦搅拌过程中铝的织构变化和力学性能

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摘要

Annealed 1050-aluminum sheets were severely deformed at the strain magnitude of 2.32 through constrained groove pressing (CGP) process. Texture variations and mechanical properties were investigated during CGP and subsequent friction stir processing (FSP) with different volume fractions of SiC nanoparticles. The results revealed that the predominant texture component in the annealed aluminum was {001}(100) cube texture. After CGP, deformed and shear texture components developed while the cube texture was partially remained. In the specimen undergone FSP without nanoparticles, {001}(110) rotated cube and nearly {001} (110) shear texture component C were mainly pronounced, which was indicative of shear deformation of material in the stir zone. Orientation distribution function analysis from the stir zone demonstrated variations in the texture development with the incorporation of SiC nanoparticles. An increase in the fraction of nanoparticles changed the grain orientation in such a way that the {001}(110) shear texture component C gradually developed from the rotated cube texture. However, the overall texture intensity became weaker by increasing the fraction of SiC nano particles due to the activation of particle stimulated nucleation mechanism forming randomly oriented grains. The incorporation of SiC nanoparticles in the stir zone also enhanced the yield strength, Young's modulus, and hardness of the stir zone without considerable reduction in the elongation. In such situation, Orowan strengthening was suggested as a dominant mechanism involved.
机译：通过约束沟槽压制（CGP）过程，退火的1050铝板在2.32的应变强度下发生严重变形。在CGP和随后的摩擦搅拌工艺（FSP）中，使用不同体积分数的SiC纳米颗粒研究了纹理变化和机械性能。结果表明，退火铝中主要的织构成分是{001}（100）立方织构。在CGP之后，变形和剪切纹理分量出现，而立方体纹理部分保留。在没有纳米颗粒的FSP试样中，主要表现出{001}（110）旋转的立方和接近{001}（110）的剪切织构分量C，这表明材料在搅拌区发生剪切变形。来自搅拌区的取向分布函数分析表明，通过掺入SiC纳米颗粒，织构发展发生了变化。纳米颗粒分数的增加改变了晶粒取向，使得{001}（110）剪切纹理分量C从旋转的立方体纹理逐渐发展。然而，由于增加了颗粒激发的成核机制的激活，形成了随机取向的晶粒，通过增加SiC纳米颗粒的比例，整体的纹理强度变得更弱。 SiC纳米颗粒在搅拌区的掺入也提高了屈服强度，杨氏模量和搅拌区的硬度，而伸长率没有明显降低。在这种情况下，有人建议将加强Orowan作为主导机制。

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