淬火转移时间对7055铝合金抗晶间腐蚀能力的影响  

Effects of Quenching Transferring Time on the Intergranular Corrosion Resistance of Aluminum Alloy 7055

作　　者：李国锋[1,2] 张新明[1] 刘胜胆[1] 

机构地区：[1]中南大学材料科学与工程学院 [2]长沙大学机电工程系,长沙410083

出　　处：《特种铸造及有色合金》2008年第10期743-745,共3页Special Casting & Nonferrous Alloys

基　　金：教育部博士点基金资助项目(2004053304);湖南省教育厅科研基金资助项目(05C054)

摘　　要：采用光学显微镜和透射电镜等分析技术研究了淬火转移时间对含Zr和无Zr的7055铝合金晶间腐蚀抗力的影响。结果表明,随着淬火转移时间的延长,合金的晶间腐蚀深度增加,合金的晶间腐蚀抗力降低。含Zr合金较无Zr合金具有更好的抗晶间腐蚀能力。据组织观察认为淬火转移时间延长致使晶界无沉淀析出带宽化是合金晶间腐蚀抗力下降的主要原因,Zr的添加阻碍再结晶从而提高合金的抗晶间腐蚀能力。Effects of quenching transferring time on the intergranular corrosion resistance of aluminum alloy containing Zr or free were observed by OM (optical microscope) and SEM (scanning electronic microscope). The results reveal that with increasing in the quenching transferring time, the intergranular corrosion depth is increased, showing the fading of intergranular corrosion resistance of alloy. However, the intergranular corrosion resistance of the alloy containing Zr is superior to that of one free Zr. The increase of quenching transferring time results in widening grain boundary precipitate free zone, which is primarily responsible for the decrease of intergranular corrosion resistance. The Zr addition can increase intergranular corrosion resistance as a result of inhibiting recrystallization.

关 键 词：7055铝合金 淬火转移时间 晶间腐蚀抗力 晶界无沉淀析出带 

分 类 号：TG166.3[金属学及工艺—热处理] TG172[金属学及工艺—金属学]