scholarly journals Internal Friction and Young Modulus Behaviour of Hot-Rolled Cu-Al-Ni-Ti Shape Memory Alloys

1996 ◽  
Vol 06 (C8) ◽  
pp. C8-413-C8-416 ◽  
Author(s):  
E. Cesari ◽  
C. Seguí ◽  
J. Pons ◽  
F. Perelló
Keyword(s):  
Internal Friction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Young Modulus ◽  
Hot Rolled

Effect of Heat Treatments on the Damping Characteristics of TiNi-Based Shape Memory Alloys

2006 ◽  
Vol 319 ◽  
pp. 33-38 ◽  
Author(s):  
I. Yoshida ◽  
Kazuhiro Otsuka
Keyword(s):  
Internal Friction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Low Frequency ◽  
Heat Treatments ◽  
Damping Capacity ◽  
Temperature Hysteresis ◽  
Temperature Spectrum ◽  
Two Peaks ◽  
Very High

Low frequency internal friction of Ti49Ni51 binary and Ti50Ni40Cu10 ternary shape memory alloys has been measured. The effect of solution and aging heat treatments on the damping property was examined. The temperature spectrum of internal friction for TiNi binary alloy consists, in general, of two peaks; one is a transition peak which is associated with the parent-martensite transformation and is rather unstable in a sense that it strongly depends on the frequency and decreases considerably when held at a constant temperature. The other one is a very high peak of the order of 10-2, which appears at around 200K. It appears both on cooling and on heating with no temperature hysteresis, and is very stable. The behavior of the peak is strongly influenced by the heat treatments. The trial of two-stage aging with a purpose of improving the damping capacity has been proved unsatisfactory. TiNiCu has a very high damping, the highest internal friction reaching 0.2, but by quenching from very high temperature, say 1373K, the damping is remarkably lowered. For the realization of high damping the quenching from a certain temperature range around 1173K seems the most preferable condition.

Structural Effects of Thermomechanical Processing on the Static and Dynamic Responses of Powder Metallurgy Fe-Mn-Si Based Shape Memory Alloys

2016 ◽  
Vol 97 ◽  
pp. 153-158 ◽  
Author(s):  
Elena Mihalache ◽  
Bogdan Pricop ◽  
Radu Ioachim Comăneci ◽  
Marius Gabriel Suru ◽  
Nicoleta Monica Lohan ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Structural Changes ◽  
Thermomechanical Processing ◽  
Mechanical Analysis ◽  
Dynamic Responses ◽  
Surface Areas ◽  
Specimen Holder ◽  
Hot Rolled

Fe-14Mn-6Si-9Cr-5Ni (wt. %) shape memory alloys (SMAs) were produced by powder metallurgy (PM) combined with Mechanical Alloying (MA). The specimens were pressed and sintered under Ar atmosphere from as blended powders as well as from mixtures of as blended and 10, 20, 30 and 40 vol. % MA’ed powders, respectively. The five groups of sintered specimens were hot-rolled, spark-erosion cut and solution treated at five temperatures (923, 1023, …, 1373K/ 300 s/ water). Tensile loading-unloading tests were performed in order to obtain stress-induced martensite at different pre-straining degrees. The static responses of the twenty five types of specimens were evaluated by means of the surface areas under unloading curve (E2) and between loading and unloading curves (E1) which were used for determining static internal friction, Q-1. The dynamic responses of the undeformed specimens were determined by Dynamic Mechanical Analysis (DMA) performed at room temperature with a three-point-bending specimen holder in strain sweep mode. The structure of the twenty five specimens was analyzed X-ray diffraction. The effects of MA fraction were correlated with static and dynamic responses via structural changes.

Internal friction in FeMnCrSiNi shape memory alloys

1994 ◽  
Vol 211-212 ◽  
pp. 212-215 ◽  
Author(s):  
R.B. Pérez-Sáez ◽  
M.L. Nó ◽  
J. San Juan
Keyword(s):  
Internal Friction ◽  
Shape Memory Alloys ◽  
Shape Memory

Internal Friction and Microdeformation on Cu-Al-Ni Shape Memory Alloys

1993 ◽  
Vol 119-121 ◽  
pp. 323-330
Author(s):  
Vicente Recarte ◽  
J. Herreros ◽  
M.L. Nó ◽  
José San Juan
Keyword(s):  
Internal Friction ◽  
Shape Memory Alloys ◽  
Shape Memory

Combustion Synthesis of Ni-Ti-X Shape Memory Alloys

1991 ◽  
Vol 246 ◽  
Author(s):  
John J. Moore ◽  
Ru Chun Yi
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Combustion Synthesis ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Liquid Product ◽  
New Method ◽  
Transition Temperatures ◽  
Hot Rolled

AbstractCombustion synthesis is an energetically favorable new method of producing Ni-Ti series shape memory alloys (SMA′s). The ΔH°f,,298/Cp298 ratio plays a key role, especially if a liquid product is required. Solidified TiNi SMA's were hot rolled into plates exhibiting the shape memory effect. Ms transition temperatures can be controlled from -78 to 460°C by substituting Fe or Pd for Ni.

Internal friction of Ti–Ni–Cu ternary shape memory alloys

2004 ◽  
Vol 370 (1-2) ◽  
pp. 444-448 ◽  
Author(s):  
I. Yoshida ◽  
D. Monma ◽  
K. Iino ◽  
T. Ono ◽  
K. Otsuka ◽  
...  
Keyword(s):  
Internal Friction ◽  
Shape Memory Alloys ◽  
Shape Memory
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