Powder metallurgical fabrication processes for NiTi shape memory alloy parts

Welding and Joining of NiTi Shape Memory Alloys: A Review

“…Martensitic transformations, as those taking place in shape memory alloys, are diffusionless transformations [3]. When such transformations occur only by effect of temperature, the macroscopic shape change is negligible.…”

Effect of Space Holders on Fabrication of Porous Titanium Alloy-Hydroxyapatite Composite through Powder Injection Molding

“…In biomedical implants, the concept of preparing porous structure is developed due to enhance the ingrowth of tissue into the pores. Therefore in PM, there are various techniques that are able to fabricate porous composite such as gas entrapment (Murray & Dunand 2003), conventional pressing and sintering (Oh et al 2003) and space holder (Bram et al 2002;Manonukul et al 2010;Raza et al 2014;Wen et al 2001). …”

Fabrication of Single-Phase NiTi by Combustion Synthesis of Mechanically Activated Powders

“…Arc melting requires multiple remelts to achieve sufficient homogeneity, while induction melting has the drawback of oxygen contamination [4]. The powder metallurgy technique has also been used for the NiTi fabrication and offers the ability to avoid the problems of casting defects due to segregation and to produce a variety of component shapes while minimizing subsequent machining operations [5]. Among the mentioned techniques, combustion synthesis (CS) has advantages of time and energy savings that make it an attractive alternative to the conventional methods for the production of various classes of materials [6].…”