Effect of heating schedule on pore structure and mechanical property of porous TiNi body produced by self-propagating high-temperature synthesis

Author

Kang, Ji-Hoon ; Kim, Ji-Soon ; Kwon, Young-Soon ; Nam, Tae-Hyun ; Kang, Seung-aik

Author_Institution

Biosmart. Ltd., Ulsan, South Korea

Volume

2

fYear

2001

fDate

26 Jun-3 Jul 2001

Firstpage

255

Abstract

Porous TiNi body was produced by self-propagating high-temperature synthesis (SHS) method. Control of pore structure and mechanical properties were investigated by varying the heating schedule before ignition. Three types of heating schedule (A, B and C) were used to produce a temperature gradient within the reactant green body of the (Ti+Ni) powder mixture. Pore size was determined by SEM observation and image-analysis. Mechanical properties such as tensile strength, strain and elastic modulus were measured by tensile tests. Phases formed in porous TiNi products were determined by XRD analysis. The porosity of all TiNi bodies produced showed no great variation, i.e. it was in range of 62-64% relative density. However, differences in average pore size were evident. From XRD data, it could be confirmed that TiNi (B2 and B19´) phase exists as the main phase. DSC results showed that all specimens have a shape memory effect

Keywords

X-ray diffraction; combustion synthesis; differential scanning calorimetry; elastic moduli; nickel alloys; porosity; porous materials; powder metallurgy; scanning electron microscopy; shape memory effects; stress-strain relations; temperature distribution; tensile strength; titanium alloys; DSC; SEM; Ti-Ni powder mixture; TiNi; XRD analysis; average pore size; elastic modulus; heating schedule; image-analysis; mechanical properties; pore structure; porosity; porous TiNi body; reactant green body; self-propagating high-temperature synthesis; shape memory effect; strain; temperature gradient; tensile strength; tensile tests; Heating; Ignition; Mechanical factors; Mechanical variables measurement; Powders; Strain measurement; Temperature control; Tensile strain; Testing; X-ray scattering;

fLanguage

English

Publisher

ieee

Conference_Titel

Science and Technology, 2001. KORUS '01. Proceedings. The Fifth Russian-Korean International Symposium on

Conference_Location

Tomsk

Print_ISBN

0-7803-7008-2

Type

conf

DOI

10.1109/KORUS.2001.975247

Filename

975247