Properties of TiNi intermetallic compound industrially produced by combustion synthesis

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:175556

Kaieda, Yoshinari ^[1]

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1. National Research Inst. for Metals, Ibaraki (Japan)

Most TiNi shape memory intermetallic compounds are conventionally produced by the process including high frequency induction vacuum melting and casting. A gravity segregation occurs in a cast TiNi ingot because of the big difference in the specific gravity between Ti and Ni. It is difficult to control accurately the phase transformation temperature of TiNi shape memory intermetallic compound produced by the conventional process, because the martensitic transformation temperature shifts by 10K due to the change in 0.1 % of Ni content. Homogeneous TiNi intermetallic compound is produced by the industrial process including combustion synthesis method, which is a newly developed manufacturing process. In the new process, phase transformation temperatures of TiNi can be controlled accurately by controlling the ratio of Ti and Ni elemental starting powders. The chemical component, the impurities and the phase transformation temperatures of the TiNi products industrially produced by the process are revealed. These properties are vitally important when combustion synthesis method is applied to an industrial mass production process for producing TiNi shape memory intermetallic compounds. TiNi shape memory products are industrially and commercially produced today the industrial process including combustion synthesis. The total production weight in a year is 30 tins in 1994.

• OSTI ID: 175556
• Report Number(s): CONF-9501103--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMBUSTION
INTERMETALLIC COMPOUNDS
MELTING
NICKEL ALLOYS
PHASE TRANSFORMATIONS
POWDERS
PROCESSING
SHAPE MEMORY EFFECT
SYNTHESIS
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS