EFFECT OF AGING ON THE MARTENSITIC TRANSFORMATION CHARACTERISTICS OF A Ni -RICH NiTiHf HIGH TEMPERATURE SHAPE MEMORY ALLOY
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The effect of aging on the microstructure and transformation temperatures of Ni50.3Ti34.7Hf15 was studied. Small interparticle spacing induced by the precipitation of very fine particles, 4-5 nm in size, decreases Ms after short term aging at 450°C and 500°C. The precipitate size and volume fraction increase with aging at longer times and higher temperatures, and as a consequence, Ms increases due to Ni-depletion of the matrix. In general, thermal stability is improved due to precipitation hardening. © 2012 World Scientific Publishing Company.
author list (cited authors)
EVIRGEN, A., BASNER, F., KARAMAN, I., NOEBE, R. D., PONS, J., & SANTAMARTA, R.