摘要
采用硬度和电导率测试、晶间腐蚀和剥落腐蚀试验、光学金相电镜观察,研究强化固溶处理对含锶钪7085型铝合金(Al-8.34Zn-1.89Mg-1.83Cu-0.15Zr-0.060Sr-0.10Sc)硬度、电导率、晶间腐蚀和剥落腐蚀性能的影响。结果表明,与常规固溶(470℃×2 h)处理相比,强化固溶(470℃×2 h+480℃×2 h+490℃×2 h)处理使合金中粗大析出相溶解更为充分,晶粒(亚晶粒)等轴性显著提高。经强化固溶处理加传统T6(121℃×24 h)处理后合金的硬度提高、电导率略有降低,抗晶间腐蚀和剥落腐蚀性能显著提高。
Effect of enhanced-solid-solution treatment on hardness,electrical conductivity,intergranular corrosion and exfoliation corrosion properties of Sr and Sc microalloyed 7085 aluminum alloy（Al-8.34Zn-1.89Mg-1.83Cu-0.15Zr-0.060Sr-0.10Sc） were investigated by means of hardness and electrical conductivity test,intergranular corrosion and exfoliation corrosion test,and optical microscope observation.The results show that compare with the conventional solid-solution treatment（470 ℃×2 h）,the enhanced-solid-solution treatment（470 ℃×2 h＋480 ℃×2h＋490 ℃×2 h） promotes greatly the dissolution of coarse second phase and improves equi-axis degree of grains.After enhanced-solid-solution and conventional T6（121 ℃×24 h） treatment,the alloy exhibites a higher hardness,a slightly lower electrical conductivity,and a considerable improvement of intergranular corrosion resistance and exfoliation corrosion resistance.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2012年第11期28-32,共5页
Transactions of Materials and Heat Treatment
基金
江苏省工业科技支撑计划项目(BE2008118)
江苏大学优秀青年学术骨干培育专项基金(1211110001)资助
江苏省高校研究生科研创新计划项目(CXLX110563)
关键词
7085型铝合金
强化固溶处理
锶钪微合金化
晶间腐蚀
剥落腐蚀
7085 aluminum alloy
enhanced solid-solution treatment
Sr and Sc microalloying
intergranular corrosion
exfoliation corrosion
