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

作　　者：夏明六[1] 韩成树 马立群[2] 丁毅[2] 

机构地区：[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

出　　处：《热加工工艺》2010年第14期141-144,共4页Hot Working Technology

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0.4185μA/cm2,钝化电位区间为419 mV。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.

关 键 词：热处理 铁磁性形状记忆合金 耐蚀性能 力学性能 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TG113.226[金属学及工艺—合金]