Metal injection molding of shape memory alloys using prealloyed NiTi powders

Metal injection molding (MIM) was applied for the production of shape memory parts using prealloyed NiTi powders with different Ni contents as starting materials. The MIM process allows the production of near-net-shape components without the occurrence of rapid tool wear as found in the case of conv...

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Bibliographic Details
Published in:Journal of materials science 2005-08, Vol.40 (16), p.4231-4238
Main Authors: Schöller, E, Krone, L, Bram, M, Buchkremer, H. P, Ståaver, D
Format: Article
Language:English
Subjects:
Alloy powders
alloys
Applied sciences
behavior
calorimetry
differential scanning calorimetry
Elongation
Exact sciences and technology
feedstocks
injection
Injection molding
Intermetallic compounds
Intermetallics
Machining
manufacturing
Martensite
Martensitic transformations
Materials science
Metals. Metallurgy
Near net shaping
nickel
Nickel base alloys
Nickel compounds
Nickel titanides
phase transition
Phase transitions
powders
Shape effects
Shape memory
Shape memory alloys
Sintering (powder metallurgy)
Tensile tests
Titanium compounds
Tool wear
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Summary:Metal injection molding (MIM) was applied for the production of shape memory parts using prealloyed NiTi powders with different Ni contents as starting materials. The MIM process allows the production of near-net-shape components without the occurrence of rapid tool wear as found in the case of conventional machining operations. With optimized manufacturing conditions, including feedstock preparation, injection parameters and sintering conditions, densities of more than 98% of the theoretical value could be achieved. Determination of the phase transformation behavior, as a basic requirement for the shape memory effect, was done by differential scanning calorimetry (DSC). In a first approach, tensile tests in the austenitic state showed pseudoelastic behavior. An elongation at failure of 3.8% was found. For martensite, up to 5% was obtained. Reasons for the lower strain compared to melted NiTi alloys are discussed. For martensitic samples the one-way shape memory effect (1WE) was demonstrated.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-2819-5