应变速率对纯铝变形结构和取向的影响

doi:10.11896/cldb.19120164

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Abstract During plastic deformation,there are complex deformation mechanism in the process of grain refinement. Further deformation will not change the overall microstructure and properties when the material microstructure reaches a stable state. The minimum size not only depend on the material internal properties, for example crystal structure and stacking fault energy,it is also affected by external conditions, such as strain rate and deformation temperature. 1060 commercial pure aluminum was investigated in high strain rate deformation (500—1 500 s^-1)by Split Hopkinson Pressure Bar. Microstructural and crystal orientation were characterized using FEI Verios 460 SEM and FEI Nano SEM Nova 430, respectively. The results show that the increase of strain ratethe grains are refined obviously and the preferred orientation exists in the grains. Forming a large number of low angle grain boundaries, the hardness reaches 430 MPa. It shows that for pure aluminum with high dislocation energy and low melting point, high strain rate can promote the formation of low angle grain boundary and improve the hardness of the material.

Key words： pure aluminum high strain rate microstructure low angle grain boundaries hardness

Published: 24 December 2020

CLC number:

TG146.2

Fund:This work was financially supported by the Joint Found of Shenyang National Laboratory for Materials Science Key Laboratory of Advanced Processing and Recycling of Nonferrous Materials (18LHPY007), Innovation and Enterprise Foundation of Gansu Provincial Science & Technology Department (18CX6JA025).

About author:: Bing Wang is now a master′s degree candidate at the State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals (SKL), Lanzhou University of Technology. His research has focused on the severe plastic deformation, damage and failure of metals.
Jisen Qiao is a professor and Ph.D. supervisor at College of Material Science and Engineering, Lanzhou University of Technology. He received his Ph.D. degree in materials processing engineering from department of welding engineering, Lanzhou University of Technology. His group research topics are mainly focused on the design of welded joints and components of light alloys in automobile industry, damage and failure of the materials during large plastic deformation. He published more than 60 journal papers and applied 7 national invention patents. He once awarded the first prize of Technology Progress of Gansu Province, and second prize of ministry of metallurgical nonferrous industry.

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Cite this article:

WANG Bing,QIAO Jisen,XIA Zonghui. Effect of Strain Rate on Deformation Structure and Orientation of Pure Aluminum[J]. Materials Reports, 2020, 34(24): 24104-24108.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19120164 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24104

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