Microstructures evolution and mechanical properties of 5052 aluminium alloy processed by constrained groove pressing

Kai Yang, Zehua Zou, J. Zeng, Wen Chen
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引用次数: 2

Abstract

Commercial 5052 aluminium alloy sheets were subjected to a severe plastic deformation technique known as constrained groove pressing (CGP) at room temperature. The impact of repeated CGP, upon the microstructure refinement was investigated by polarised optical microscope as well as transmission electron microscope. Changes in mechanical properties, measured by tensile test and hardness test, were related to the evolution of microstructures. Moreover, the microhardness, measured on the polished cross-section of each as-pressed sheet, was plotted to provide a pictorial depiction of the homogeneity. The results show that the mechanical fragmentation dominates at grain refinement and a submicron grain size of about 300 nm was achieved in 5052 aluminium alloy sheets by imposing severe plastic strains of 4.64 utilising the CGP technique. The average microhardness increase dramatically after one pass and then slightly increases with increasing passes, but the homogeneous distribution of microhardness decreases after one pass and then recovers in subsequent passes result in the corresponding uniform distribution of microstructure. In addition, the ultimate tensile strength clearly increases with increasing passes and the elongation decreases after one pass and then remains reasonably constant with further passes.
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约束槽挤压5052铝合金的组织演变与力学性能
商业5052铝合金板在室温下经受称为约束槽挤压(CGP)的严重塑性变形技术。用偏光显微镜和透射电子显微镜研究了重复CGP对微观结构细化的影响。通过拉伸试验和硬度试验测量的力学性能变化与微观结构的演变有关。此外,绘制了在每一个压制片材的抛光横截面上测量的显微硬度,以提供均匀性的图形描述。结果表明,在晶粒细化时,机械破碎占主导地位,利用CGP技术施加4.64的严重塑性应变,在5052铝合金板中获得了约300nm的亚微米晶粒尺寸。平均显微硬度在一道次后显著增加,然后随着道次的增加而略有增加,但显微硬度的均匀分布在一道后降低,然后在随后的道次中恢复,导致微观组织的均匀分布。此外,极限抗拉强度明显随着道次的增加而增加,伸长率在一道次后降低,然后随着进一步的道次保持合理的恒定。
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来源期刊
CiteScore
1.20
自引率
0.00%
发文量
3
期刊介绍: IJCMSSE is a refereed international journal that aims to provide a blend of theoretical and applied study of computational materials science and surface engineering. The scope of IJCMSSE original scientific papers that describe computer methods of modelling, simulation, and prediction for designing materials and structures at all length scales. The Editors-in-Chief of IJCMSSE encourage the submission of fundamental and interdisciplinary contributions on materials science and engineering, surface engineering and computational methods of modelling, simulation, and prediction. Papers published in IJCMSSE involve the solution of current problems, in which it is necessary to apply computational materials science and surface engineering methods for solving relevant engineering problems.
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