Thickness Inhomogeneity in Hardness and Microstructure of Copper After the Compressive Stage in High-Pressure Torsion

Yuepeng Song; Wenke Wang; 이동준; 정혁재; 이성학                                         /LEE SUNG HAK; 김형섭

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자료유형: 학술저널

저자정보: Yuepeng Song Wenke Wang 이동준 정혁재 이성학 /LEE SUNG HAK 김형섭

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.21 No.1

발행연도: 2015.1

수록면: 7 - 13 (7page)

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Distinction between plastic deformation occuring in compression and compression–torsion stages isimportant for understanding the properties and microstructures of materials processed by high-pressure torsion(HPT). In the present study, remarkable through-thickness inhomogeneities of hardness and microstructurewere found in the samples processed by compression stage of HPT. Three regions on the radialdirection plane of compressed disks were defined to display the inhomogeneity: edge zone (high hardness),radial medium zone (uniform hardness) and center zone (low hardness near the surface and highhardness in the thickness central plane). A low hardness region in the center near the surface was detectedand found to stretch along the upper and bottom surfaces of the disks compressed by low pressure. Thislow hardness region was also found to decrease with increasing the pressure. Not only the hardness butalso the microstructure through-thickness inhomogeneity is attributed to stress and strain distribution in thedisk as well as to a huge friction between the anvil and the disk during processing.

#deformation #strength #grain refinement #severe plastic deformation

참고문헌 (21)

참고문헌 신청

김형섭 / 2014 / 등통로각압축 공정의 소성변형과 전산모사 / 대한금속·재료학회지 52(2):87~99

M. Seyed Salehi / 2014 / An Upper Bound Solution for Twist Extrusion Process / Metals and Materials International 20(5):825~834

유성진 / 2014 / 반복겹침접합압연법으로 제조한 탄소나노튜브 강화 마그네슘기지복합재료의 미세구조와 강화 메커니즘 / 대한금속·재료학회지 52(7):561~572

A. P. Zhilyaev / 2008 / Prog. Mater. Sci 893:53

Yuepeng Song / 2014 / Finite Element Analysis of the Effect of Friction in High Pressure Torsion / Metals and Materials International 20(3):445~450

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