Gradient porosity and large pore size NiTi shape memory alloys

Porous NiTi alloys with gradient porosity and large pore size were successfully fabricated by using a temporary space-holder (NH 4HCO 3) and a conventional sintering method. The pore characteristics of the porous alloys can be tailored effectively by changing the amount of NH 4HCO 3 added, and the u...

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Veröffentlicht in:	Scripta materialia 2007-12, Vol.57 (11), p.1020-1023
Hauptverfasser:	Zhang, Y.P., Li, D.S., Zhang, X.P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Alloys Gradient porosity Intermetallics Nickel base alloys Nickel compounds Nickel titanides NiTi shape memory alloy Phase transformation Porosity Shape memory alloys Superelasticity Temporary space-holder Titanium compounds
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Beschreibung
Zusammenfassung:	Porous NiTi alloys with gradient porosity and large pore size were successfully fabricated by using a temporary space-holder (NH 4HCO 3) and a conventional sintering method. The pore characteristics of the porous alloys can be tailored effectively by changing the amount of NH 4HCO 3 added, and the use of NH 4HCO 3 has no influence on the microstructure and phase transformation behavior of the porous alloys. The fabricated samples with radial gradient porosity exhibit excellent superelasticity (higher than 4%).
ISSN:	1359-6462 1872-8456
DOI:	10.1016/j.scriptamat.2007.07.043