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为了探索均匀化处理对ZA35-0.3Zr合金组织和性能的影响规律,通过组织分析、力学性能、电化学性能测试,确定了ZA35-0.3Zr合金均匀化处理的适宜温度和时间。结果表明,ZA35-0.3Zr合金枝晶偏析明显,晶界上Cu富集严重,存在非平衡β相。随着均匀化处理时间增加,ZA35-0.3Zr合金中CuZn5相逐渐消除,β相共析分解程度加大。对合金进行370℃×12h均匀化处理后,晶界处CuZn5相消除,枝晶偏析大大减少,同时非平衡β相基本消除,抗拉强度为306MPa,伸长率为7.35%。在3.5%的NaCl溶液中,开路电位与未均匀化处理合金相比变正,腐蚀电流密度减小了33.1%,耐腐蚀性增强。ZA35-0.3Zr合金适宜的均匀化处理工艺为370℃×12h。
In order to explore the influence of homogenization treatment on the microstructure and properties of ZA35-0.3Zr alloy, the suitable temperature and time for homogenization treatment of ZA35-0.3Zr alloy were determined through the analysis of microstructure, mechanical properties and electrochemical performance. The results show that the dendritic segregation of ZA35-0.3Zr alloy is obvious, and the enrichment of Cu on the grain boundary is serious with unbalanced β phase. With the increase of homogenization time, the phase of CuZn5 in ZA35-0.3Zr alloy gradually disappears and the degree of eutectoid decomposition of β phase increases. After the alloy was homogenized at 370 ℃ for 12h, the CuZn5 phase at the grain boundary was eliminated and the dendritic segregation was greatly reduced. At the same time, the unbalanced β phase was basically eliminated. The tensile strength was 306MPa and the elongation was 7.35%. In 3.5% NaCl solution, the open circuit potential is more positive than that of the un-homogenized alloy, the corrosion current density is reduced by 33.1% and the corrosion resistance is enhanced. ZA35-0.3Zr alloy suitable homogenization process for 370 ℃ × 12h.