微量鋯與安定化退火對Al-4.7Mg-0.75Mn 合金腐蝕與機械性質之影響

藉由微結構觀察、ASTM G67硝酸腐蝕重量損失測試及機械性質測試（硬度、拉伸），探討微量鋯與安定化退火對Al-4.7Mg-0.75Mn (AA5383)合金腐蝕與機械性質之影響，結果顯示，不論是否含微量鋯之Al-4.7Mg-0.75Mn合金，於220℃下進行安定化退火熱處理，合金均會發生沿晶腐蝕敏感現象；但當安定化退火溫度升高至250℃時，雖然合金之機械強度會下降，但均無沿晶腐蝕敏感問題；且經250℃安定化退火之含鋯合金機械性質（UTS=348MPa、YS=254MPa、EL=12.0%）優於經220℃安定化退火之未含鋯合金（UTS=337MPa、YS=250MPa、EL=9.5%），也就是說藉由微量鋯的添加與適當的安定化熱處理，可以獲得兼具良好抗蝕能力與機械性質之Al-4.7Mg-0.75Mn合金。

關鍵字

Al-4.7Mg-0.75Mn ；安定化退火；微結構；機械性質；腐蝕性質

並列摘要

Effect of minor zirconium addition and stabilizing annealing on the corrosion and mechanical properties of Al-4.7Mg-0.75Mn alloys were studied by analysing the microstructure, mechanical properties and the Nitric Acid Mass Loss Test (NAMLT). The results indicated that the intergranular corrosion (IGC) occurred no matter Al-4.7Mg-0.75Mn alloys contains zirconium or not after stabilizing annealing at 220℃. However, it is non-IGC if raising the stabilizing annealing temperature to 250℃. Furthermore, the alloy contains zirconium with a stabilizing annealing at 250℃ has better mechanical properties (UTS=348MPa, YS=254MPa, EL=12.0%) than the alloy without zirconium which stabilizing annealing at 220℃(UTS=337MPa, YS=250MPa, EL=9.5%). The Al-4.7Mg-0.75Mn alloy with minor zirconium addition as well as a suitable stabilizing annealing heat treatment have both excellent corrosion resistance and mechanical properties in the same time.

並列關鍵字

Al-4.7Mg-0.75Mn ； stabilizing annealing ； microstructure ； mechanical properties ； corrosion resistance

參考文獻

[VAS1] A. K. Vasudevan and R. D. Doherty,” Aluminum alloy-contemporary research and application,”p.87.(1989)

[VAS2] A. K. Vasudevan and R. D. Doherty,” Aluminum alloy-contemporary research and application,”p.84.(1989)

[MAS] T. B. Massalski, J.L. Murray, L.H. Bennett, and H. Baker, “Binary Alloy Phase Diagrams”, ASM International, Ohio, p.130.(1990)

Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum

[BHA] N.R.M.R. BHARGAVA, I. SAMAJDAR, S. RANGANATHAN,

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微量鋯與安定化退火對Al-4.7Mg-0.75Mn 合金腐蝕與機械性質之影響

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