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In this paper, characteristics of SMA were analyzed and the research basis was researched. The connecting mechanism and mechanism of pipe coupling was introduced. Otherwise, in our research, after connecting by pipe coupling, the pipe can endure high pressure and occur blasting when the pressure reaches to 84MPa.

In this research, the Effect of extrusion pass on microstructure and transformation temperature of NiTiNb alloy was researched. The results shows that ECAP can efficiently break the hard and brittle (Ti, Nb)2Ni phase. At the same time, β-Nb phase particles were precipitated and grow up after ECAP process.Due to enhancement of interfacial energy, train energy and non-chemical free energy, transformation temperatures including: As, Af, Ms and Mf increases with extrusion pass.