The tensile behavior of a cold-rolled and reverse-transformed equiatomic TiNi alloy

Journal Article · Sun May 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90371-9· OSTI ID:5187671

Lin, H C ^[1]; Wu, S K ^[2]

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1. Feng-Chia Univ., Taichung (Taiwan, Province of China). Dept. of Materials Science
2. National Taiwan Univ., Taipei (Taiwan, Province of China). Materials Science and Engineering

The tensile test shows that the martensite accommodation/reorientation process in the as-cold-rolled equiatomic TiNi alloy is depressed due to the hindrance of deformed martensite structures and defects. If the cold-rolled equiatomic TiNi alloy is subjected to a reverse martensitic transformation (RMT) at temperature < 300 C, the strengthening effect induced by cold-rolling can significantly improve the alloy-s characteristic shape memory effect (SME) and pseudoelasticity (PE) by raising the critical shear stress for slip. The [sigma][sup M][sub y] can improve from 380 MPa of solution treated specimen to 1,000 MPa of 31% cold-rolled RMT specimen. Meanwhile, for its PE characteristic, a cold-rolling RMT process can also increase significantly the sorted mechanical energy and the energy storage efficiency. Experimental results show that, even in up to 20% thickness-reduced RMT TiNi alloy, the specimen still has 20% elongation at fracture. If the cold-rolled specimens are subjected to an annealing at temperature [>=] 400 C, the martensite accommodation/reorientation process can recover gradually due to the nullification of deformed martensite structures and defects. Finally the recrystallization occurs at annealing temperature [>=] 600 C.

• OSTI ID: 5187671
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:5; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals &amp; Alloys-- Mechanical Properties
ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
DATA
EXPERIMENTAL DATA
INFORMATION
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL DATA
PHASE TRANSFORMATIONS
TENSILE PROPERTIES
TITANIUM ALLOYS