2007, Vol. 43

Issue (11): 1221-1227 DOI:

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. . Acta Metall Sin, 2007, 43(11): 1221-1227 .

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Abstract ABSTRACT: This paper reports the successful fabrication of porous NiTi shape memory alloys with gradient porosity, large pore-size and satisfactory mechanical property by using pore-forming agent combining with hot isostatic pressing (HIP) and conventional sintering process (CS). The results showed that the porous samples can be tailored with porosity ratio and pore-size in the range of 30~61% and 50～500 μm under the reasonable control of pore-forming agent (NH4HCO3) addition amount and sintering process. It is also clearly seen that the prepared samples exhibit multi-stage martensitic transformations proved by XRD and DSC analysis, and the transition temperatures decrease with the increasing porosity ratio, and noticeably the sample possessing longitudinal gradient porosity displays very good compression property and excellent linear superelasticity higher than 4%.

Key words: Porous NiTi SMAs Gradient porosity Hot isostatic pressing Phase transformation Superelasticity

Received: 12 March 2007

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