Journal
MATERIALS CHARACTERIZATION
Volume 178, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111284
Keywords
Transformative HEA; TWIP HEA; High pressure torsion; c; a ratio; Non-basal slip
Categories
Funding
- CSIR-National Metallurgical Laboratory, India [OLP 0346, TKP2020IKA-05]
- Hungarian Ministry of Human Capacities
- National Science Foundation of the United States [DMR-1810343]
Ask authors/readers for more resources
The severe plastic deformation response of a face centered cubic twinning induced plasticity high entropy alloy subjected to high-pressure torsion was investigated. The study found that the alloy demonstrated an extensive transformation induced plasticity effect and nano-structuring with heavily dislocated structure during HPT processing. The research also quantified the fraction of c c+a dislocations and discussed their evolution in the studied alloy.
Severe plastic deformation response of a face centered cubic (FCC) twinning induced plasticity (TWIP) high entropy alloy (HEA), Fe40Mn40Co10Cr10, subjected to high-pressure torsion (HPT) is investigated. The so-called TWIP HEA demonstrated an extensive transformation induced plasticity (TRIP) effect even in 1/2 turn (shear strain, gamma = 15) of HPT processing, which increased further with increasing the number of turns to 2 (gamma = 68). Additionally, HPT induced nano-structuring and heavily dislocated structure; dislocation density was of the order of 1015 m- 2. c/a ratio of the transformed HCP phase was found to be <1.633 and it did not change with increasing the extent of shear strain. This was manifested as the occurrence of at least 50% non-basal slip in the HCP phase. For the first time, the fraction of c c+a dislocations are quantified and their evolution are discussed in the purview of the studied alloy. The micro-mechanism of strain accommodation is correlated with increasing hardness of the HEA upon sequential HPT processing. The present work provides a viewpoint that the deformation induced HCP phase in a metastable FCC HEA can have tailored c/a ratio which triggers non-basal slip, leading to a strong and ductile material.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available