摘要
采用金相显微镜、扫描电子显微镜和Х射线衍射仪显微分析技术,研究了强化固溶工艺对含Sr 2099(Al-2.52Cu-1.87Li-1.19Zn-0.497Mg-0.309Mn-0.0825Zr-0.0605Sr)型铝锂合金抗晶间腐蚀和抗剥落腐蚀性能的影响。结果表明:与常规固溶(540℃×2 h)+T8时效(121℃×14 h+151℃×48 h)工艺相比,强化固溶(540℃×2 h+550℃×2.67 h)+T8时效(121℃×14 h+151℃×48 h)工艺显著减少了合金中的粗大未溶相,再结晶程度提高,细化了晶粒,且促进等轴晶的形成。按晶间腐蚀标准(GB7998-2005)和剥落腐蚀标准(GB/T 22639-2008),强化固溶+T8时效工艺降低了该合金的抗晶间腐蚀能力,但显著提高了该合金的抗剥落腐蚀能力。
The effects of enhanced solid solution treatment on intergranular corrosion and exfoliation corrosion behavior of Sr microalloyed 2099 （ A1-2.52Cu-1.87Li-1.19Zn-0. 497Mg-0. 309Mn-0. 0825Zr-0. 0605Sr） A1-Li alloy were investigated by means of optical microscope, SEM and XRD. The results show that compared to the conventional solid solution treatment（540 ℃× 2 h） plus T8 aging（ 121 ℃×14 h ＋151 ℃×48 h）, enhanced solid solution（540 ℃× 2 h ＋550 ℃× 2.67 h） plus T8 aging can decrease coarse precipitated phases significantly, promote recrystallization, refine grains and increase the formation of equiaxed grains of the 2099-Sr Al-Li alloy. It is found that enhanced solid solution plus T8 aging decreases the resistance of intergranular corrosion, but improves the resistance of exfoliation corrosion for 2099-Sr Al-Li alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2012年第8期96-99,共4页
Transactions of Materials and Heat Treatment
基金
江苏省工业科技支撑计划项目(BE2008118)
江苏大学拔尖人才培养工程基金(1211110001)
关键词
SR
2099铝锂合金
强化固溶
晶间腐蚀
剥落腐蚀
Sr
2099Al-Li alloy
enhanced solid solution
intergranular corrosion
exfoliation corrosion
