材料科学与工程学报2007，Vol.25Issue(6)：938-942,968,6.
造孔剂法制备孔隙率可控的多孔镍钛合金
Porous Titanium-nickel Alloys with Adjustable Porosity Fabricated Using Pore-forming Agent and Conventional Sintering
摘要
Abstract
Porous nickel-titanium shape memory alloys (NiTi SMAs) with adjustable porosity were fabricated successfully by adding pore-forming agent ammonium bicarbonate and conventional sintering. It was found that the pore characteristics depended mainly on the shape and size of ammonium bicarbonate particles used, and the porosity of the alloys could.be tailored by controlling the amount of ammonium bicarbonate added. The porous NiTi SMAs fabricated mainly consisted of B2 and B19' NiTi phases, while less Ti2Ni, Ni3Ti and Ni4Ti3 phases were found even after a high temperature solution treatment. It was also found that the impurity phases increased in the porous alloys due to the addition of the pore-forming agent. In addition, a special 3-stage phase transformation took place in the porous NiTi SMAs, which was attributed to the inhomogeneity of compositions and phase constituents at grain boundaries. Moreover, phase transformation shows obvious influences on the damping behavior of the fabricated porous NiTi SMAs, while the influence from porosity was not obvious.关键词
多孔镍钛形状记忆合金/马氏体相变/造孔剂/内耗Key words
Porous nickel-titanium shape memory alloys (SMAs)/ martensitic transformation/ pore-forming agent/ internal friction分类
矿业与冶金引用本文复制引用
张宇鹏,钟志源,张新平..造孔剂法制备孔隙率可控的多孔镍钛合金[J].材料科学与工程学报,2007,25(6):938-942,968,6.基金项目
National Natural Science Foundation of China under grant (50671037), the SRG grant from the Research Committee of the CityU of HK (Project #:7001999), and the Central Allocation Grant Scheme of the research Grants Council of the Hong Kong Special Administrative Region, China (CityU 1/04C). （50671037）
