7050铝合金热轧板的淬火敏感性|张勇,,邓运来,,张新明,,刘胜胆,,杨柳,-《中国有色金属学报》官方网站|全网首发|论文开放获取

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷第10期总第115期 2008年10月

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文章编号：1004-0609(2008)10-1788-07

7050铝合金热轧板的淬火敏感性

张勇1, 2，邓运来1, 2，张新明1, 2，刘胜胆1, 2，杨柳1, 2

(1. 中南大学材料科学与工程学院，长沙 410083；
2. 有色金属材料科学与工程教育部重点实验室，长沙 410012)

摘要:

用末端淬火、光学金相显微镜和透射电镜技术研究7050铝合金热轧板的淬火敏感性。结果表明：7050铝合金末端淬火试样硬度下降10%的淬透深度约60 mm。决定7050铝合金淬火敏感性的本质是析出的η平衡相的尺寸和体积分数，主要发生η相析出的淬火临界平均冷却速率约为40 ℃/s，此时η相的体积分数约为2.1%。淬火平均冷却速率低于40 ℃/s，η相析出和粗化—再结晶—Al₃Zr非共格化交互影响。

关键字: 7050铝合金；末端淬火；淬火敏感性

Quenching sensitivity of 7050 aluminium alloy hot-rolled plate

ZHANG Yong1, 2, DENG Yun-lai1, 2, ZHANG Xin-ming1, 2, LIU Sheng-dan1, 2, YANG Liu1, 2

（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Changsha 410012, China）

Abstract:The quenching sensitivity of 7050 aluminium alloy hot-rolled plate was studied by using end quenching test and optical microscopy (OM) and transmission electron microscopy (TEM). It is showed that, the distance from the quenching end where hardness decreases by 10% is about 60 mm. The reducing of mechanical properties is mainly caused by precipitation of equilibrium η phase. The critical average quenching cooling rate for precipitation of η phase is about 40 ℃/s, at which the volume fraction of η phase is about 2.1%. When the critical average quenching cooling rate is lower than 40 ℃/s, three processes of formation and growth of η phase—recrystallization—formation of incoherent Al3Zr dispersoid happen.

Key words: 7050 aluminium alloy; end quenching; quenching sensitivity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW