A Comparative Investigation of the Porous NiTi Alloys Synthesized by Self-Propagating High-Temperature Synthesis and Combined Process of Decomposition and Sintering

Abstract:

Porous NiTi alloys were successfully synthesized by two different processes, including self-propagating high-temperature synthesis (SHS), and a combined process of decomposition – sintering. A systematic comparison of micro-structures and mechanical properties of these alloys was investigated. The results showed that the SHS process was better than decomposition – sintering process. By controlling the processing parameters of SHS, the received porous NiTi alloys showed that the porosity and pore were larger, and ratio of opened-pore reached up to 80%. The porous NiTi alloys fabricated by SHS process also exhibited good properties, such as a high compressive strength (up to 250MPa), and elastic modulus in range of 6.1 – 7.0GPa. The porous NiTi alloys synthesized by decomposition – sintering process have lower porosity (26-43%), lower compressive strength (< 110MPa), lower elastic modulus (< 1.2GPa) but the strain could be reached to 10%.

• Periodical: Applied Mechanics and Materials (Volume 889)
• Pages: 211-215
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.889.211
• Online since: March 2019
• Authors: Dang Thuy Nguyen, Ho Ky Thanh*, Tran Van Dung
• Keywords: Decomposition, Mechanical Properties, Porosity, Porous NiTi, SHS Process, Sintering

References

[1] Christian Greiner, Scott M. Oppenheimer, David C. Dunand; High strength, low stiffness, porous NiTi with superelastic properties; Acta Biomaterialia 1, 2005, p.705–716.

DOI: 10.1016/j.actbio.2005.07.005

[2] A. Bansiddhi, T.D. Sargeant, S.I. Stupp, D.C. Dunand; Porous NiTi for bone implants: A review; Acta Biomaterialia 4, 2008, p.773 – 782.

DOI: 10.1016/j.actbio.2008.02.009

[3] Meenakshi Mour, Debarun Das, Thomas Winkler, Elisa Hoenig, Gabriela Mielke, Michael M. Morlock and Arndt F. Schilling; Review: Advances in Porous Biomaterials for Dental and Orthopaedic Applications; Materials 2010, 3, p.2947 – 2974.

DOI: 10.3390/ma3052947

[4] Lorenza Petrini and Francesco Migliavacca; Review Article: Biomedical Applications of Shape Memory Alloys; Journal of Metallurgy, Volume 2011.

[5] BING-YUN LI, LI-JIAN RONG, YI-YI LI, and V.E. GJUNTER; An Investigation of the Synthesis of Ti-50 At. Pct Ni Alloys through Combustion Synthesis and Conventional Powder Sintering; METALLURGICAL AND MATERIALS TRANSACTIONS A, VOLUME 31A, JULY 2000, p.1867 – 1871.

DOI: 10.1007/s11661-006-0242-4

[6] Gang Chen, Peng Cao, Neil Edmonds; Porous NiTi alloys produced by press-and-sinter from Ni/Ti and Ni/TiH2 mixtures; Materials Science and Engineering A, vol.582, 2013, pp.117-125.

DOI: 10.1016/j.msea.2013.05.082