The study on Ti50Ni50-x(Pd,Cu)x high temperature shape memory alloys (SMAs) with Pd substituted by Cu
Date Issued
2006
Date
2006
Author(s)
Chi, Shao-Wei
DOI
zh-TW
Abstract
Ti50Ni50-x(Pd,Cu)x high temperature shape memory alloys (SMAs) with Pd substituted by Cu are studied. The effect of Cu content on SMAs’ transformation behavior, workability, shape memory effect (SME) and microstructure is also investigated. Specimens are hot-rolled and solution-treated, or cold-rolled and annealed at various temperatures and times. Experimental results show that, after solution-treated at 900℃ for 1 hour, TiNiPdCu SMAs are one stage B2←→B19 transformation. With increasing the Cu content, the cold-rolling ability of TiNiPdCu SMAs reduces and their transformation temperature and latent heat decrease linearly. The SME can be improved by increasing the number of thermal cycles. When annealing at 500℃ for a short time, transformation temperature and latent heat of specimens are near the solution-treated ones. On the other hand, the martensitic transformation of TiNiPdCu SMAs is suppressed due to the formation of Cu-rich precipitates for long annealing time. The effect of cold-rolling can be eliminated when TiNiPdCu SMAs are annealing at 650℃ in short time. When annealing time is prolonged, their transformation temperature and latent heat become stable. The up limit of the amount of Pd substituted by Cu in TiNiPdCu SMAs is suggested to be 10％.
Subjects
TiNiPdCu四元合金
冷輥壓
再結晶退火
形狀記憶效應
High temperature shape memory alloys
TiNiPdCu alloys
Cold-rolling
Annealing
Shape memory effect
Type
thesis
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