Published December 5, 2014 | Version v1
Journal article Metadata-only

Influence of aging on phase transformation and microstructure of Ni50.3Ti29.7Hf20 high temperature shape memory alloy

Creators

  • 1. Glass and Advanced Materials Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
  • 2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)

Description

Highlights: • Aging of Ni50.3Ti29.7Hf20 alloy results in higher phase transformation temperature. • TEM investigations reveal nano-scale precipitation during aging. • Precipitate size distributions are determined using SAXS/SANS. • Correlation between microstructure and hardness of the alloy is discussed. - Abstract: We report the effect of aging on phase transformation temperature and mechanical strength of Ni50.3Ti29.7Hf20 high temperature shape memory alloy. Aging of the alloy at 550 °C and 650 °C increases the martensite phase transformation temperature. Transmission Electron Microscopy and quantitative investigation of microstructure by small-angle scattering confirm the improved hardness of the alloy on aging. Aging at 550 °C results in significant volume fraction of fine Ni-rich precipitates. Further, aging at 650 °C gives rise to coarsening of the precipitates vis-à-vis reduction in hardness

Availability note (English)

Available from http://dx.doi.org/10.1016/j.jallcom.2014.06.109

Additional details

Identifiers

DOI
10.1016/j.jallcom.2014.06.109;
PII
S0925-8388(14)01465-0;

Publishing Information

Journal Title
Journal of Alloys and Compounds
Journal Volume
615
Journal Page Range
p. 469-474
ISSN
0925-8388
CODEN
JALCEU

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
47008451
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
AGING; CORRELATIONS; DISTRIBUTION; HAFNIUM COMPOUNDS; HARDNESS; MARTENSITE; MARTENSITIC STEELS; MICROSTRUCTURE; NICKEL COMPOUNDS; PHASE TRANSFORMATIONS; PRECIPITATION; SHAPE MEMORY EFFECT; SMALL ANGLE SCATTERING; TEMPERATURE RANGE 0400-1000 K; TERNARY ALLOY SYSTEMS; TITANIUM COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION
Descriptors DEC
ALLOY SYSTEMS; ALLOYS; CARBON ADDITIONS; COHERENT SCATTERING; DIFFRACTION; ELECTRON MICROSCOPY; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; MICROSCOPY; REFRACTORY METAL COMPOUNDS; SCATTERING; SEPARATION PROCESSES; STEELS; TEMPERATURE RANGE; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Copyright
Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.