退火温度对Co35Ni35Al30铁磁性形状记忆合金显微组织及耐蚀性的影响
Effect of Annealing Temperature on Microstructure and Corrosion Properties of Co35Ni35Al30 Ferromagnetic Shape Memory Alloy
孙广云 1回顺尧 1阎洪彬 2董桂馥3
作者信息
- 1. 大连大学,大连 116622
- 2. 湖南汽车工程职业学院,株洲 412000
- 3. 大连大学,大连 116622;湖南汽车工程职业学院,株洲 412000
- 折叠
摘要
采用非自耗真空熔炼炉制备了Co35Ni35Al30铁磁性形状记忆合金,并对该合金进行了退火处理.通过金相显微镜和X射线衍射仪,分析了退火温度对Co35Ni35Al30合金显微组织和形状恢复特性的影响;采用电化学测试分析了退火温度对该合金耐蚀性的影响.结果表明:随着退火温度的升高,该合金的形状记忆效应呈现先增加后降低的变化趋势,合金的显微组织逐渐细化;当退火温度为1 200℃和1 300℃时,合金的形状记忆效应几乎相当,但是当退火温度为1 200℃时,合金的强度更高;随着退火温度的升高,合金的耐蚀性呈先升高后降低的趋势,在1 200℃时,该合金的腐蚀电流密度最小,自腐蚀电位较高,腐蚀速率最小,极化电阻较大,合金的耐蚀性最好.
Abstract
The Co35Ni35Al30 ferromagnetic shape memory alloy was prepared by non-consumable vacuum melting furnace,and the alloy was annealed.The effects of annealing temperature on the microstructure and shape recovery characteristics of Co35Ni35Al30 alloy were analyzed by metallographic microscopy and X-ray diffractometer.The effect of annealing temperature on the corrosion resistance of the alloy was analyzed by electrochemical test.The results show that with the increase of annealing temperature,the shape memory effect of the alloy increased first and then decreased,and the microstructure of the alloy was gradually refined.When the annealing temperature was 1 200,1 300℃,the shape memory effect of the alloy was almost the same,but when the annealing temperature was 1 200℃,the strength of the alloy was higher.With the increase of annealing temperature,the corrosion resistance of the alloy increased first and then decreased.At 1 200℃,the corrosion current density of the alloy was the smallest,the self-corrosion potential was relatively high,the corrosion rate was the smallest,the polarization resistance was relatively larg,and the corrosion resistance of the alloy was the best.
关键词
Co35Ni35Al30形状记忆合金/退火温度/显微组织/耐蚀性Key words
Co35Ni35Al30 shape memory alloy/annealing temperature/microstructure/corrosion resistance引用本文复制引用
基金项目
辽宁省自然科学基金(20180550101)
出版年
2024
NETL
NSTL
万方数据