摘要
采用硬度、电导率测试和显微组织观察等手段,研究了二级时效温度对2099铝锂合金硬度、电导率、抗晶间腐蚀和抗剥落腐蚀性能的影响。结果表明:经过121℃×14 h一级时效和不同温度(151、161、171、181、191和201℃)下的48 h二级时效热处理后,硬度值先随二级时效温度的升高而显著增加,在181℃时达到峰值,然后在191℃时开始出现下降趋势,201℃时大幅下降;电导率随二级时效温度变化较小;在二级时效温度为181℃,即峰值硬度时的抗晶间腐蚀性能最差;二级时效温度对抗剥落腐蚀性能影响不大。
Effects of second step aging temperature on hardness,electric conductivity,intergranular and exfoliation corrosion properties of2099 Al-Li alloy were investigated by Vickers hardness and electric conductivity tests,and optical microscopy. The results show that,when 2099 Al-Li alloy is aged double-step,which includes the first aging treatment( 121 ℃ for 14 h) and the second step aging treatment at different temperatures( 151,161,171,181,191 and 201 ℃) for 48 h,its hardness greatly improves with the increase of the second step aging temperature and reaches its peak value at 181 ℃. The hardness begins to decrease slightly at 191 ℃ and drop sharply at 201 ℃.Conductivity varies slightly with the second step aging temperature. At the second step aging temperature of 181 ℃,i. e,the peak hardness state,the intergranular corrosion resistance of the alloy is the worst. No significant effects of the second step aging temperature on exfoliation corrosion are observed.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第9期137-141,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)
江苏大学拔尖人才培养工程基金(1211110001)
江苏省高校优势学科建设工程项目
