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Development of ultrafine grained Al 7075 by cryogenic temperature large strain extrusion machining

Published online by Cambridge University Press:  20 September 2018

Xiaolong Yin ,
Yunyun Pi ,
Di He ,
Jiayang Zhang  and
Wenjun Deng
Xiaolong Yin
Affiliation:
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
Yunyun Pi
Affiliation:
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
Di He
Affiliation:
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
Jiayang Zhang
Affiliation:
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
Wenjun Deng*
Affiliation:
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
*
a)Address all correspondence to this author. e-mail: dengwj@scut.edu.cn
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Abstract

Large strain extrusion machining (LSEM) emerges as an innovative severe plastic deformation method of fabricating ultrafine grained materials. However, substantial heat generated during LSEM would sacrifice the mechanical properties of materials. Cryogenic temperature (CT) LSEM is put forward to overcome this shortcoming. The Al 7075 was processed by cryogenic and room temperature (RT) LSEM to investigate their comparative effects on mechanical and microstructural properties. Results indicate that the chip morphology of CT LSEM is featured with better integrity. Grains are refined to less than 200 nm by CT LSEM. A more complicated microstructure with high dislocation density is observed in the CT LSEM specimens. The hardness of cryogenic and RT LSEM specimens increases with the compression ratio and reaches the highest values of 187HV and 170HV, respectively. Dislocation strengthening is the main contributor, accounting for the higher hardness of CT LSEM specimens.

Keywords

machiningmicrostructurealloy

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Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3449 - 3457
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

b)

This article has been updated since original publication. A notice detailing this change has also been published at https://doi.org/10.1557/jmr.2018.383.

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