Microstructures and shape memory characteristics of a Ti–20Ni–30Cu (at.%) alloy strip fabricated by the melt overflow process

2010 ◽  
Vol 62 (2) ◽  
pp. 71-74 ◽  
Author(s):  
Seok-won Kang ◽  
Yeon-Min Lim ◽  
Yong-hee Lee ◽  
Hyo-jung Moon ◽  
Yeon-wook Kim ◽  
...  
Keyword(s):  
Shape Memory ◽  
Alloy Strip ◽  
Memory Characteristics ◽  
Overflow Process

Shape Memory Characteristics of Ti50Ni50-xCux(x=35, 40) Alloy Strips

2008 ◽  
Vol 47-50 ◽  
pp. 463-466
Author(s):  
Yeon Wook Kim ◽  
Tae Hyun Nam ◽  
Sang Hoon Lee
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Alloy Strip ◽  
X Ray Diffraction ◽  
Strip Surface ◽  
X Ray ◽  
Columnar Grains ◽  
One Step ◽  
Transformation Hysteresis ◽  
Memory Characteristics

The shape memory alloy strips of Ti50Ni15Cu35 and Ti50Ni10Cu40 had been fabricated by arc melt overflow. Their microstructures and shape memory characteristics were investigated by means of X-ray diffraction, optical microscopy and differential scanning calorimetries. The microstructure of as-cast strips exhibited columnar grains normal to the strip surface. X-ray diffraction analysis showed that one-step martensitic transformation of B2-B19 occurred in the alloy strips. According to the DSC analysis, it was known that the martensitic transformation temperature (Ms) of B2→B19 was 71.2°C in Ti50Ni15Cu35 and 64.5°C in Ti50Ni10Cu40 alloy strip, respectively. During thermal cyclic deformation with the applied stress of 60 MPa, transformation hysteresis and elongation associated with the B2-B19 transformation were observed to be 4.9°C and 1.4% in Ti50Ni15Cu35 alloy strip. However, Ti50Ni10Cu40 alloy strip was so brittle that its mechanical properties could not be measured.

SHAPE MEMORY PROPERTIES OF RAPIDLY SOLIDIFIED Ti50Ni50-XCuX (X = 20, 25) ALLOY STRIPS

2008 ◽  
Vol 01 (03) ◽  
pp. 203-208 ◽  
Author(s):  
YEON WOOK KIM ◽  
TAE HYUN NAM
Keyword(s):  
Shape Memory ◽  
Xrd Analysis ◽  
Alloy Strip ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Strip Surface ◽  
Columnar Grains ◽  
Transformation Hysteresis ◽  
Rapidly Solidified ◽  
Memory Characteristics

The shape memory alloy strips of Ti 50 Ni 30 Cu 20 and Ti 50 Ni 25 Cu 25 have been fabricated by arc melt overflow technique. Their microstructures and shape memory characteristics were investigated by means of X-ray diffraction (XRD), optical microscopy and differential scanning calorimetry (DSC). The microstructure of the as-cast strips exhibited columnar grains normal to the strip surface. XRD analysis showed that the martensitic transformation of B2–B19 occurred in the alloy strips. During thermal cyclic deformation with the applied stress of 60 MPa, transformation hysteresis and elongation associated with the B2–B19 transformation were observed to be 4.9°C and 1.8% in Ti 50 Ni 30 Cu 20 alloy strip and 3.5°C and 1.7% in Ti 50 Ni 25 Cu 25 alloy strip. The as-cast strip of Ti 50 Ni 25 Cu 25 alloy also showed a perfect superelasticity and its stress hysteresis was as small as 14 MPa. These mechanical properties and shape memory characteristics of the alloy strips were ascribed to B2–B19 transformation and the controlled microstructures produced by rapid solidification of the arc melt overflow process.

Improvement of shape memory characteristics by precipitation-hardening of TiPdNi alloys

1998 ◽  
Vol 34 (1-2) ◽  
pp. 23-29 ◽  
Author(s):  
S. Shimizu ◽  
Ya Xu ◽  
E. Okunishi ◽  
S. Tanaka ◽  
K. Otsuka ◽  
...  
Keyword(s):  
Shape Memory ◽  
Precipitation Hardening ◽  
Ni Alloys ◽  
Memory Characteristics

Shape memory characteristics of cold drawn Ti-Ni wires

2003 ◽  
Vol 112 ◽  
pp. 761-764
Author(s):  
Y. Xu ◽  
K. Otsuka ◽  
H. Yoshida ◽  
H. Nagai ◽  
R. Oishi ◽  
...  
Keyword(s):  
Shape Memory ◽  
Memory Characteristics

Transformation behavior and shape memory characteristics of Ti-(45-x)Ni-5Cu-xV alloys

2007 ◽  
Author(s):  
Ju-young Choi ◽  
Eunsoo Choi ◽  
Baik-Soon Cho ◽  
Young-soo Chung ◽  
Tae-hyun Nam
Keyword(s):  
Shape Memory ◽  
Transformation Behavior ◽  
Memory Characteristics
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