Improvement of a Ti[sub 50]Pd[sub 30]Ni[sub 20] high temperature shape memory alloy by thermomechanical treatments

Journal Article · Sun May 15 00:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90271-2· OSTI ID:7236641

Golberg, D; Xu, Ya; Murakami, Y; Morito, S; Otsuka, K ^[1]; Ueki, T; Horikawa, H ^[2]

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1. Univ. of Tsukuba, Ibaraki (Japan). Inst. of Materials Science
2. Furukawa Electric Co. Ltd., Yokohama (Japan). Yokohama R and D Lab.

Shape memory alloys (SMA) have been of considerable interest the past years as possible functional materials, now actually being used for various practical applications. To the present, the most useful among SMA is the TiNi alloy, because of its unique combination of excellent shape memory (SM) characteristics and sufficient ductility. However, the practical usage of TiNi is limited by temperature to about 373 K, due to the temperature range of thermoelastic martensitic transformation (MT). Presently, there is a strong need to develop high temperature SMA to be used for various actuators in aircraft and automobiles, pipe coupling, etc. Among several metallic systems with a high temperature interval of MT, NiAl and TiPd alloys seem to be most attractive. In fact, the poor ductility at ambient temperature and the transformation from martensite to Ni[sub 5]Al[sub 3], instead of the reverse transformation upon heating, are still the serious problems which restrict the development of SMA based on the first alloy. No one has studied the effect of thermomechanical treatment on SME in TiPd-Ni alloys, which was successfully applied already for improvement of SM characteristics in TiNi compounds. Thus, the purpose of the present paper is to report the results of high temperature tensile tests in a straight forward manner for the cold rolled and heat treated alloy Ti[sub 50]Pd[sub 30]Ni[sub 20], whose temperature range of MT (490--520 K) is very close to the most hopeful interval for application of high temperature SMA.

• OSTI ID: 7236641
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 30:10; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL ALLOYS
SHAPE MEMORY EFFECT
THERMOMECHANICAL TREATMENTS
PALLADIUM ALLOYS
TITANIUM BASE ALLOYS
DEFORMATION
EXPERIMENTAL DATA
MICROSTRUCTURE
STRAINS
ALLOYS
DATA
FABRICATION
HEAT TREATMENTS
INFORMATION
MATERIALS WORKING
NUMERICAL DATA
PLATINUM METAL ALLOYS
TITANIUM ALLOYS
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties