热处理对Ni-Ga-Fe-Co系铁磁形状记忆合金力学及耐蚀性能的影响
Effect of Heat Treatment on Mechanical Properties and Corrosion Resistance of Ni-Ga-Fe-Co Ferromagnetic Shape Memory Alloy
夏明六1, 韩成树1, 马立群2, 丁 毅2
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作者单位：1. 安徽省特种设备检测院铜陵分院, 安徽 铜陵 244000; 2. 南京工业大学 材料科学与工程学院, 江苏 南京 210009)
中文关键字：热处理； 铁磁性形状记忆合金； 耐蚀性能； 力学性能
英文关键字：heat treatment; ferromagnetic shape memory alloy; corrosion resistance; mechanical properties
中文摘要：采用电子万能试验机、显微硬度计以及电化学综合测试仪分别测试了Ni-Ga-Fe-Co系合金抗压强度、显微硬度和在w(NaCl)=3.5%溶液中的阳极极化曲线；研究了热处理对Ni-Ga-Fe-Co系铁磁形状记忆合金耐蚀性能与力学性能的影响。 结果表明，室温下铸态Ni50Ga27Fe17Co6合金的耐腐蚀性能最好。热处理使Ni-Ga-Fe-Co系合金的耐蚀性能下降，抗压强度增大，显微硬度取决于热处理后合金的显微组织。热处理后Ni53Ga27Fe15Co5合金的耐蚀性能最好，其自腐蚀电位为-355 mV，腐蚀电流密度为0.4185 μA/cm2，钝化电位区间为419 mV。
英文摘要：Compressive strength and microhardness of Ni-Ga-Fe-Co shape memory alloy were measured by microhardness tester and multi-function electronic testing machine. Corrosion resistances of the Ni-Ga-Fe-Co alloy before and after heat treatment were studied by electrokinetic polarization testing in 3.5%NaCl solution. The effects of heat treatment on the corrosion resistance and mechanical properties of the Ni-Ga-Fe-Co alloy were investigated. The results show that the Ni50Ga27Fe17Co6 alloy has the highest corrosion resistance at room temperature. Corrosion resistance of the Ni-Ga-Fe-Co alloy decreases and compressive strength increases after heat treatment. Microhardness of the Ni-Ga-Fe-Co alloy is determined by microstructure after heat treatment. The alloy after heat treatment with the corrosion potential and corrosion current density of -355 mV and 0.4185 μA/cm2, and the passivation potential zone about 419 mV has the highest corrosion resistance.