摘要
研究了不同热处理工艺、晶粒束缚以及工作温度、应力循环、热循环和应力热循 环对 CuZnAl合金超弹性的影响。试验结果表明:合金常规淬火获得最佳超弹性的 淬火加热温度为890℃,对于所研究的线材试样而言,保温时间与线材直径有关;合 金采用双相区淬火,可获得较好的超弹性,其最佳淬火加热温度为700℃,保温时间 为10min;晶粒束缚影响合金的超弹性,gs/D越大,晶粒束缚越小,超弹性越好; 合金的超弹性与工作温度有关,超弹性最佳值是在Af点以上一段温度范围内.其下限 温度为Af点以上17~22℃。合金在应力循环后出现了循环软化现象而不是循环硬 化现象,应力循环后,相变的熵及焓变降低;热循环和应力热循环均使合金的相变点 提高。
The effect of heat treatment cycle (the normal quenching and the quen- ching from double phase zone), grain restraint, operating temperature, stress cycling, heating cycling and stress heating cycling on the superelasticity of CuZnAl alloys has been investigated. The experiment results are as follows: the normal quenching heating temperature to obtain excellent superelasticity of CuZnAl alloys is 890℃, the holding time τ is related to specimen diameter D (τ=2.43D-0.97). The superelasticity of alloys is very well when the alloy has been quenched from double phase zone and the excellent quenching heating temperature is 700℃ for holding time 10 minutes. The grain restraint has an effect on the superelasticity of alloy, the bigger the gs/D, the less the grain restraint and the better the superelasticity of alloy. The superelasticity of alloy is related to operating temperature, the excellent superelasticity is in the temperature region above Af, and the lower temperature limit is Af + 17-22℃. The alloys present cycling softening phenomenon during stress cycling, the values of △s and △H of transformation decrease after stress cycling. Whether the heating cycling or the stress heating cycling is proceeded, theMs temp- erature increases.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
1991年第1期39-46,60,共9页
Journal of Dalian University of Technology
关键词
形状记忆合金
超弹性
CUZNAL
应力
quenching
grain
stress
heating
cooling
cycling/superelasticity
CuZnAl shape memory alloy