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研究了快速凝固对Fe-Mn-Si形状记忆合金形状记忆效应及耐腐蚀性能的影响。结果表明,快速凝固由于大大细化晶粒,增加了基体强度;同时,快速凝固具有大的过冷度,导致较多层错的产生,有利于ε马氏体的形核,从而显著提高合金的形状记忆效应,和铸态合金相比,其形状回复率提高幅度达到24%~160%左右。在不存在容易被基体吸附且易形成可溶性化合物的离子时,晶界增加,会降低合金的耐腐蚀性能,所以快速凝固合金在Na OH溶液中的耐腐蚀性能低于铸态合金;而在HCl溶液中,存在容易被基体吸附生成易溶化合物的Cl-,同时这种离子不易穿透快速凝固合金更为致密的氧化膜,所以快速凝固合金的耐腐蚀性能高于铸态合金。
The effect of rapid solidification on the shape memory effect and corrosion resistance of Fe-Mn-Si shape memory alloy was studied. The results show that the rapid solidification increases the matrix strength due to the grain refinement. At the same time, the rapid solidification has a large degree of undercooling, resulting in more layer faults, which are favorable for the nucleation of ε martensite, thereby significantly increasing the alloy Shape memory effect, compared with cast alloy, the shape recovery rate increased by about 24% to 160%. In the absence of ions that are easily adsorbed by the substrate and soluble in soluble compounds, the grain boundary increases and the corrosion resistance of the alloy decreases. Therefore, the corrosion resistance of the rapidly solidified alloy in NaOH solution is lower than that of the as-cast alloy. In HCl In the solution, Cl- is easily adsorbed by the substrate to form a soluble compound. At the same time, this ion is not easily penetrated into the denser oxide film of the rapidly solidified alloy. Therefore, the corrosion resistance of the rapidly solidified alloy is higher than that of the as-cast alloy.