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Title: Martensitic transformation behaviors of rapidly solidified Ti–Ni–Mo powders

Abstract

For the fabrication of bulk near-net-shape shape memory alloys and porous metallic biomaterials, consolidation of Ti–Ni–Mo alloy powders is more useful than that of elemental powders of Ti, Ni and Mo. Ti{sub 50}Ni{sub 49.9}Mo{sub 0.1} shape memory alloy powders were prepared by gas atomization, and transformation temperatures and microstructures of those powders were investigated as a function of powder size. XRD analysis showed that the B2–R–B19 martensitic transformation occurred in powders smaller than 150 μm. According to DSC analysis of the as-atomized powders, the B2–R transformation temperature (T{sub R}) of the 25–50 μm powders was 18.4 °C. The T{sub R} decreased with increasing powder size, however, the difference in T{sub R} between 25–50 μm powders and 100–150 μm powders is only 1 °C. Evaluation of powder microstructures was based on SEM examination of the surface and the polished and etched powder cross sections and the typical images of the rapidly solidified powders showed cellular morphology. Porous cylindrical foams of 10 mm diameter and 1.5 mm length were fabricated by spark plasma sintering (SPS) at 800 °C and 5 MPa. Finally these porous TiNi alloy samples are heat-treated for 1 h at 850 °C, and then quenched in ice water. Themore » bulk samples have 23% porosity and 4.6 g/cm{sup 3} density and their T{sub R} is 17.8 °C.« less

Authors:
 [1]
  1. Department of Advanced Materials, Keimyung University, 1000 Shindang-dong, Dalseo-gu, Daegu 704-701 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22215526
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 10; Conference: IFFM2011: 2011 international forum on functional materials, Jeju Island (Korea, Republic of), 28-31 Jul 2011, AFM-2: 2. special symposium on advances in functional materials, Jeju Island (Korea, Republic of), 28-31 Jul 2011; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; CROSS SECTIONS; HEAT TREATMENTS; MICROSTRUCTURE; PHASE TRANSFORMATIONS; POROSITY; POROUS MATERIALS; POWDERS; SCANNING ELECTRON MICROSCOPY; SHAPE MEMORY EFFECT; SURFACES; X-RAY DIFFRACTION

Citation Formats

Kim, Yeon-wook. Martensitic transformation behaviors of rapidly solidified Ti–Ni–Mo powders. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.04.063.
Kim, Yeon-wook. Martensitic transformation behaviors of rapidly solidified Ti–Ni–Mo powders. United States. https://doi.org/10.1016/J.MATERRESBULL.2012.04.063
Kim, Yeon-wook. 2012. "Martensitic transformation behaviors of rapidly solidified Ti–Ni–Mo powders". United States. https://doi.org/10.1016/J.MATERRESBULL.2012.04.063.
@article{osti_22215526,
title = {Martensitic transformation behaviors of rapidly solidified Ti–Ni–Mo powders},
author = {Kim, Yeon-wook},
abstractNote = {For the fabrication of bulk near-net-shape shape memory alloys and porous metallic biomaterials, consolidation of Ti–Ni–Mo alloy powders is more useful than that of elemental powders of Ti, Ni and Mo. Ti{sub 50}Ni{sub 49.9}Mo{sub 0.1} shape memory alloy powders were prepared by gas atomization, and transformation temperatures and microstructures of those powders were investigated as a function of powder size. XRD analysis showed that the B2–R–B19 martensitic transformation occurred in powders smaller than 150 μm. According to DSC analysis of the as-atomized powders, the B2–R transformation temperature (T{sub R}) of the 25–50 μm powders was 18.4 °C. The T{sub R} decreased with increasing powder size, however, the difference in T{sub R} between 25–50 μm powders and 100–150 μm powders is only 1 °C. Evaluation of powder microstructures was based on SEM examination of the surface and the polished and etched powder cross sections and the typical images of the rapidly solidified powders showed cellular morphology. Porous cylindrical foams of 10 mm diameter and 1.5 mm length were fabricated by spark plasma sintering (SPS) at 800 °C and 5 MPa. Finally these porous TiNi alloy samples are heat-treated for 1 h at 850 °C, and then quenched in ice water. The bulk samples have 23% porosity and 4.6 g/cm{sup 3} density and their T{sub R} is 17.8 °C.},
doi = {10.1016/J.MATERRESBULL.2012.04.063},
url = {https://www.osti.gov/biblio/22215526}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 10,
volume = 47,
place = {United States},
year = {Mon Oct 15 00:00:00 EDT 2012},
month = {Mon Oct 15 00:00:00 EDT 2012}
}