H. Bao-Quan, North University of China, Taiyuan, China
Abstract
The modification of an Fe-14Mn-5Si-9Cr-5Ni shape memory alloys (SMAs) by copper addition has been carried out in the present paper, aiming at further enhancing its corrosion resistance. The results of electrochemical potentiodynamic measurement and immersion test showed that copper remarkably improved its corrosion resistance behavior in Cl- solution. On the other hand, it was found not to markedly affect the mechanical properties or the shape memory effect (SME). The multiple effects of copper on Fe-Mn-Si based alloys were discussed in view of that the strengthen austenite is one of key factor to improve SME.
Key words: FeMnSiCrNi, shape memory effect, corrosion resistance, strengthen, Copper
Summary: Modification of an Fe-Mn-Si-Cr-Ni alloys has been made by Cu addition. Electrochemical potentiodynamic measurement and immersion test show the alloying element Cu is remarkable improve the corrosion resistance behavior of Fe-14Mn-5Si-9Cr-5Ni alloy in solutions with Cl-. Mechanical properties and SME of the Fe-14Mn-5Si-9Cr-5Ni alloy were not markedly influenced by Cu addition respectively. With the amount of Cu increasing, the strength and SME were very slightly decreased, which correspondingly confirm that to strengthen the austenite to improve yield strength is one of the key factors correlative with the shape memory recovery in the Fe-Mn-Si based SMAs.
