Effect of aging treatment on shape memory characteristics of tape-shaped Ti-Ni alloy element fabricated by a centrifugal casting method.

2017 ◽  
Vol 2017 (0) ◽  
pp. OS1305
Author(s):  
Takuya TSUDA ◽  
Hiroki CHO
Keyword(s):  
Shape Memory ◽  
Centrifugal Casting ◽  
Aging Treatment ◽  
Alloy Element ◽  
Casting Method ◽  
Ni Alloy ◽  
Memory Characteristics

Shape Memory Characteristics of Ti-Ni Alloy Using Mechanically Alloyed Powder

2003 ◽  
Vol 2003.1 (0) ◽  
pp. 265-266
Author(s):  
Akira TERAYAMA ◽  
Takeshi KADOMURA ◽  
Hideki KYOGOKU ◽  
Shinichiro KOMATSU ◽  
Fusahito YOSHIDA ◽  
...  
Keyword(s):  
Shape Memory ◽  
Alloyed Powder ◽  
Mechanically Alloyed ◽  
Ni Alloy ◽  
Memory Characteristics

K-0401 Shape Memory Characteristics in Resistance Welded Ti-50.9at%Ni Alloy Wires

2001 ◽  
Vol I.01.1 (0) ◽  
pp. 81-82
Author(s):  
Yasunori Masunaga ◽  
Jae-Il Kim ◽  
Toshio Sakuma ◽  
Kazuo Murata ◽  
Shuichi Miyazaki
Keyword(s):  
Shape Memory ◽  
Ni Alloy ◽  
Memory Characteristics

Shape Memory Effect and Superelasticity of an Equiatomic Ti-Ni Alloy with Surface Sulfide Layers

2006 ◽  
Vol 510-511 ◽  
pp. 262-265
Author(s):  
Tae Hyun Nam ◽  
Shin Goo Hur ◽  
Jae Hwa Lee ◽  
Gyu Bong Cho
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Tensile Tests ◽  
Constant Load ◽  
Ni Alloy ◽  
Memory Characteristics ◽  
Scanning Electron ◽  
Start Temperature

Shape memory characteristics and superelasticity of an equiatomic Ti-Ni alloy with surface sulfide layers were investigated by means of thermal cycling tests under constant load, tensile tests, and scanning electron microscopy. Martensitic transformation start temperature (Ms) increased by sulfidation, which is ascribed to a compressive stress imposed by surface sulfide layers. Surface sulfide layers were found to make transformation elongation be small when their thickness was less than 5 ㎛. This is ascribed to the fact that the surface sulfide layers were not detached from substrates and constrained martensitic transformation. When thickness of the surface sulfide layers was 35 ㎛, transformation elongation was not affected by them because they were detached during transformation. Superelastic recovery decreased by the sulfide layers when their thickness was about 5 ㎛, while it did not change when the thickness was about 35 ㎛.

EFFECT OF ANNEALING ON SHAPE MEMORY CHARACTERISTICS OF Ti-50.85at.%Ni ALLOY

2008 ◽  
Vol 01 (03) ◽  
pp. 209-213 ◽  
Author(s):  
J. I. KIM ◽  
T. H. NAM ◽  
Y. J. LEE ◽  
S. MIYAZAKI
Keyword(s):  
Shape Memory ◽  
Transformation Temperature ◽  
Annealing Temperature ◽  
Tensile Tests ◽  
Phase Transformation Temperature ◽  
Martensitic Transformation Temperature ◽  
Ni Alloy ◽  
The Matrix ◽  
Cold Worked ◽  
Memory Characteristics

In order to clarify the effect of annealing on the shape memory behavior of Ti -50.85at.% Ni alloy, the deformation and transformation behavior were investigated using tensile tests and differential scanning calorimeter (DSC). The martensitic transformation temperature increases with increasing annealing temperature until it reach as a maximum, and then decreases with further increasing annealing temperature. This can be rationalized by interaction between the distribution of Ti 3 Ni 4 precipitates and recovery of cold-worked structure. The R-phase transformation temperature increases with increasing annealing temperature until reaching a maximum, and then decreases with a further increase of annealing temperature. This is attributed to the change of Ni content in the matrix caused by precipitation of Ti 3 Ni 4. The critical stress for slip decreases rapidly with increasing annealing temperature, influenced by interaction between the distribution of Ti 3 Ni 4 precipitates and recovery of cold-worked structure.

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