A combinatorial study on the influence of Cu addition, film thickness and heat treatment on phase composition, texture and mechanical properties of Ti–Ni shape memory alloy thin films

2010 ◽  
Vol 518 (8) ◽  
pp. 1897-1913 ◽  
Author(s):  
Cesare Borgia ◽  
Sven Olliges ◽  
Marianne Dietiker ◽  
Giancarlo Pigozzi ◽  
Ralph Spolenak
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Composition ◽  
Shape Memory Alloy ◽  
Film Thickness ◽  
Shape Memory

scholarly journals Direct Measurement of the Nanoscale Mechanical Properties of NiTi Shape Memory Alloy

2003 ◽  
Vol 791 ◽  
Author(s):  
Gordon A. Shaw ◽  
Wendy C. Crone
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloy ◽  
Film Thickness ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Spherical Cavity ◽  
Niti Shape Memory Alloy ◽  
Cavity Model ◽  
Critical Film Thickness

ABSTRACTThe mechanical properties of sputter-deposited NiTi shape memory alloy thin films ranging in thickness from 35 nm to 10 μm were examined using nanoindentation and atomic force microscopy (AFM). Indents made in films as thin as 150 nm showed partial shape recovery upon heating, although film thickness was found to have a marked effect on the results. A modified spherical cavity model is used to describe the findings, which suggest that the substrate tends block the shape memory effect as film thickness decreases below a threshold level which is specific to applied load. This has the net effect of decreasing the indent recovery below the critical film thickness. The fact that the spherical cavity model predicts the critical film thickness at which the shape memory effect is blocked indicates that the increased recovery of nanoscale indentations is due to a suppression of plastic processes rather than an enhancement of shape memory processes.

Effect of Heat Treatment Temperature on the Mechanical Property in Cast TiNi Shape Memory Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 1493-1496
Author(s):  
Kazuhiro Kitamura ◽  
Yutaka Sawada ◽  
Toshio Kuchida ◽  
Tadashi Inaba ◽  
Masataka Tokuda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Tensile Test ◽  
Shape Memory ◽  
Treatment Temperature ◽  
Scanning Calorimetry ◽  
Temperature Synthesis ◽  
Treatment Conditions ◽  
High Temperature Synthesis

The heat treatment effect of a cast shape memory alloy (SMA) from self-propagating high temperature synthesis (SHS) ingot was investigated. The composition of SHS ingot was Ti-50.8at%Ni. DSC and Tensile test specimens were cast by lost-wax process from SHS ingot. The heat treatment conditions were 400°C-60min., 500°C-60min. and 600°C-60min. for DSC and 400°C-60min. and 500°C-60min. for tensile test. Transformation temperatures were measured by differential scanning calorimetry (DSC). Mechanical properties were measured by a tensile test at several temperatures. The effects of heat treatment temperatures were same as a general TiNi wire material.

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