Space-holder engineered porous NiTi shape memory alloys with improved pore characteristics and mechanical properties

作者：Li, D S; Zhang, Y P; Ma, X; Zhang, X P^*

来源：Journal of Alloys and Compounds, 2009, 474(1-2): L1-L5.

DOI：10.1016/j.jallcom.2008.06.043

• Porous NiTi SMAs
• Space-holder
• Powder sintering
• Superelasticity
• Pore hereditary feature

In this study, porous Ti-50.8 at.% Ni shape memory alloys (SMAs) with tailored pore characteristics and porosities as well as adjustable mechanical properties were successfully prepared by using a novel poreforming technique and powder sintering process. The results show that the use of the sieved NH4HCO3 particle (i.e., the space-holder) greatly facilitates the fabrication of porous NiTi alloys with more satisfactory pore features, improved pore size-uniformity and distribution, and thus significantly increased mechanical properties (including excellent linear superelasticity) than that using no-sieved NH4HCO3 powder. It is also shown that pore size of the space-holder engineered porous NiTi alloys increases correspondingly with the size of sieved NH4HCO3 particles added, and there exists a geometrical heredity effect of space-holder NH4HCO3 particles on pore shape and size of the porous NiTi alloys.

• 出版日期2009-4-17
• 单位华南理工大学