Grain Size Effect on Mechanical Properties Under Biaxial Stretching in Pure Tantalum

This paper reports the mechanical properties and formability under biaxial stretching in pure tantalum as a function of average grain size. The grain size of pure tantalum was adjusted from submicron to tens of micron using the high-pressure torsion process and subsequent annealing. The stretch form...

Full description

Saved in:
Bibliographic Details
Published in:Metals and materials international 2019, 25(6), , pp.1448-1456
Main Authors: Lee, Hak Hyeon, Hwang, Kyo Jun, Jung, Jaimyun, Kim, Gwang Lyeon, Song, Yi Hwa, Park, Sung Taek, Oh, Kyeong Won, Kim, Hyoung Seop
Format: Article
Language:English
Subjects:
Biaxial loads
Characterization and Evaluation of Materials
Chemistry and Materials Science
Deformation
Engineering Thermodynamics
Erichsen test
Formability
Grain size
Heat and Mass Transfer
Localization
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Mechanical properties
Metallic Materials
Processes
Roughening
Size effects
Solid Mechanics
Strain localization
Stretching
Tantalum
Work hardening
재료공학
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper reports the mechanical properties and formability under biaxial stretching in pure tantalum as a function of average grain size. The grain size of pure tantalum was adjusted from submicron to tens of micron using the high-pressure torsion process and subsequent annealing. The stretch formability was evaluated using a miniaturized Erichsen tester. Under uniaxial tension, the mechanical properties of pure tantalum followed the typical strength-ductility trade-off behavior according to the average grain size. Nevertheless, the stretch formability became rather significantly inferior in the coarse-grain tantalum, which was primarily attributed to the poor resistance to strain localization and limited work hardening capacity. This deterioration was supposed to be due to the intensified strain localization with increasing the average grain size, based on the in-grain deformation heterogeneity within individual grains and the surface roughening after the Erichsen test. Consequently, this study suggests that the excellent stretch formability and work hardening capacity under biaxial loading can be achieved at a certain range of the average grain size (8.25–19.3 μm in this work).
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-019-00294-3