NDLI: Reproducibility Study of NiTi Parts Made by Metal Injection Molding

Content Provider	Springer Nature Link
Author	Bram, M. Bitzer, M. Buchkremer, H. P. Stöver, D.
Copyright Year	2012
Abstract	Powder metallurgy (P/M) is an attractive manufacturing process for net-shaped NiTi parts considering the limited machinability of NiTi alloys. Nevertheless, the industrial implementation of P/M processing for NiTi alloys is not trivial. To become competitive to manufacturing of NiTi alloys based on established ingot metallurgy, combination of fully pronounced shape memory behavior with sufficient mechanical properties is required. Successful use of P/M technology is strongly influenced by high affinity of NiTi alloys for uptake of oxygen and carbon, which leads to the formation of oxygen-containing Ti$_{2}$Ni and TiC phases coupled with increase of Ni content in the matrix. In the case of Ni-rich NiTi alloys, this increase leads to a shift of phase transformation temperatures to lower values. Furthermore, precipitation of Ni$_{4}$Ti$_{3}$ during cooling from sintering temperature is difficult to avoid. Even if these precipitates might be used to decrease the Ni:Ti ratio of the matrix balancing oxygen and carbon uptake, significant loss of ductility arises, especially in the case of finely dispersed Ni$_{4}$Ti$_{3}$ precipitates. In the present work, each step of P/M manufacturing is discussed regarding its influence on the specific properties of NiTi alloys. The work is based on the application of prealloyed, gas atomized NiTi powders. Metal injection molding was used for net-shaped manufacturing of tensile samples, which enabled detailed study of sintering behavior combined with investigation of shape memory and mechanical properties depending on particle size, oxygen and carbon content as well as precipitation of Ni$_{4}$Ti$_{3}$ phase.
Starting Page	2701
Ending Page	2712
Page Count	12
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	21
Issue Number	12
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2012-06-12
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	intermetallics nitinol nonferrous metals powder metallurgy shape memory Tribology, Corrosion and Coatings Engineering Design Quality Control, Reliability, Safety and Risk Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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