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一种7055型铝合金的RRA处理
引用本文:郑子樵,李红英,莫志民.一种7055型铝合金的RRA处理[J].中国有色金属学报,2001,11(5):771-776.
作者姓名:郑子樵  李红英  莫志民
作者单位:[1]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实
摘    要:通过时效曲线测定和慢应变拉伸实验以及透射电镜观察,研究了不同热处理制度对一种7055型铝合金拉伸性能,时效组织和抗应力腐蚀性能的影响。结果表明,实验合金采用RRA处理,可使晶内保持类似于T6状态的显微结构,同时使晶界析出物的大小和分布特征与过时效状态相当,从而可使强度达到T6峰值状态的水平,抗应力腐蚀性能则优于T6状态,RRA处理改善抗应力腐蚀性能的原因可能与粗大,孤立分布的晶界析出物有助于阻止氢脆以及缩小界内和晶界电化学差异有关。

关 键 词:RRA处理  应力腐蚀  显微组织  铝合金  时效
文章编号:1004-0609(2001)05-0771-06
修稿时间:2001年4月25日

Retrogression and reaging treatment of a 7055 type aluminum alloy
ZHENG Zi qiao,LI Hong ying,MO Zhi ming.Retrogression and reaging treatment of a 7055 type aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2001,11(5):771-776.
Authors:ZHENG Zi qiao  LI Hong ying  MO Zhi ming
Abstract:The influence of heat treatment on the tensile properties, microstructure and resistance to SCC of a 7055 type aluminum alloy was investigated using aging curves measurement, slow strain tensile test and TEM observations. The results show that RRA treatment can provide the microstructure of a T6 temper in the matrix and the grain boundary precipitate structure possessed of a overaged(T7) condition. Thus strength of the alloy can be achieved the levels of T6 temper and the resistance to SCC better than that of T6 temper. Improved resistance to SCC by the RRA treatment is believed to result from the large coarsening grain boundary precipitates, which form during RRA treatment and can inhibite hydrogen embrittlement and decrease the electrochemical difference between grain boundaries and grain interior.
Keywords:RRA treatment  stress corrosion  microstructure  7055 alloy
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