CN104313520A - 铝、锌、镁、铜7000系合金厚板分级时效处理方法 - Google Patents

铝、锌、镁、铜7000系合金厚板分级时效处理方法 Download PDF

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CN104313520A
CN104313520A CN201410032473.XA CN201410032473A CN104313520A CN 104313520 A CN104313520 A CN 104313520A CN 201410032473 A CN201410032473 A CN 201410032473A CN 104313520 A CN104313520 A CN 104313520A
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aluminium
zinc
magnesium
copper
stage aging
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杨晓光
焦兴贵
许晨玲
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DALIAN HUICHENG ALUMINUM Co Ltd
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DALIAN HUICHENG ALUMINUM Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor

Abstract

本发明属于一种铝、锌、镁、铜7000系合金厚板分级时效处理方法，其特征在于采取以下步骤：a.将7000系合金厚板放到箱式淬火炉（1）中进行淬火处理，淬火温度升温到477±3℃，保持时间为80~100min；b.在水冷却容器（2）中冷却；c.在时效炉（3）中进行分级时效处理，第一级时效温度120±3℃；第二级时效温度155±3℃；第三级时效温度120±3℃；d.加工成试样，在电子万能试验机（4）上拉伸，同时在光学显微镜（5）下进行显微组织的观察并检测晶粒的变化；在电导率仪（6）中进行电导率的测定。该方法处理的7000系合金厚板提高了铝合金材料的力学性能，断裂韧性明显提高。

Description

铝、锌、镁、铜7000系合金厚板分级时效处理方法
技术领域
本发明属于金属处理方法，特别涉及一种铝、锌、镁、铜7000系合金厚板分级时效处理方法。
背景技术
美国的铝、锌、镁、铜7000系铝合金是在航空工业中应用最早而现在仍在广泛应用的一种超硬铝，早在40年代就有定型产品，在50年代初即已在美铝协会注册。当时为了得到高强度结构材料，主要采用峰值时效制度，但这种调质状态下的材料对应力腐蚀开裂很敏感，断裂韧性也很低。因此，7000系铝合金抗应力腐蚀性能（SCR）的改善问题，一直受到极大重视。为了解决强度与抗蚀性间的矛盾，Cina于1974年提出了回归再时效制度（RRA），即将7000-T6在200~260℃回归几分钟后再进行一次T6处理（120℃×24h）。后来Brown等提出的三级时效制度，就是在RRA的基础上，降低了回归温度，使回归处理时间延长到以小时计的水平并把第一和第三时效温度控制在80~163℃间，使RRA制度向使用方向又前进一大步。但是，还存在着调质状态对应力腐蚀开裂敏感、断裂韧性低的不足。
发明内容
本发明的目的在于克服上述技术不足，提供一种进一步提高7000系铝合金厚板力学性能，对应力腐蚀开裂敏感差，断裂韧性高的铝、锌、镁、铜7000系合金厚板分级时效处理方法。
本发明解决技术问题所采用的技术方案是：一种铝、锌、镁、铜7000系合金厚板分级时效处理方法，其特征在于采取以下步骤：
a.将铝、锌、镁、铜7000系合金厚板放到箱式淬火炉中进行淬火处理，淬火温度升温到477±3℃，保持时间为80~100min；淬火转移时间t1≤30~50s；
b.淬火处理后的铝、锌、镁、铜7000系合金厚板，在水冷却容器中冷却；
c.将冷却后的铝、锌、镁、铜7000系合金厚板放到时效炉中进行分级时效处理，第一级时效温度120±3℃，保持时间为4~6h；第二级时效温度155±3℃，保持时间为24~28h；第三级时效温度120±3℃，保持时间4~6h；
d.将时效处理后的铝、锌、镁、铜7000系合金厚板自然冷却到常温后，加工成试样，在电子万能试验机上拉伸，测出抗拉强度、屈服强度和伸长率；同时在光学显微镜下进行显微组织的观察并检测晶粒的变化；在电导率仪中进行电导率的测定。
本发明的有益效果是：该方法处理的铝、锌、镁、铜7000系合金厚板明显提高了铝合金材料的力学性能，降低了对应力腐蚀开裂的敏感性，断裂韧性明显提高。
附图说明
以下结合附图，以实施例具体说明。
图1是铝、锌、镁、铜7000系合金厚板分级时效处理方法的流程框图。
图中：1-箱式淬火炉；2-水冷却容器；3-时效炉；4-电子万能试验机；5-光学显微镜；6-电导率仪。
具体实施方式
实施例，参照附图，一种铝、锌、镁、铜7000系合金厚板分级时效处理方法，其特征在于采取以下步骤：
a.将铝、锌、镁、铜7000系合金厚板放到箱式淬火炉1中进行淬火处理，淬火温度升温到477±3℃，保持时间为80~100min；淬火转移时间t1≤30~50s；
b.淬火处理后的铝、锌、镁、铜7000系合金厚板，在水冷却容器2中冷却；
c.将冷却后的铝、锌、镁、铜7000系合金厚板放到时效炉3中进行三级时效处理，第一级时效温度120±3℃，保持时间为4~6h；第二级时效温度155±3℃，保持时间为24~28h；第三级时效温度120±3℃，保持时间4~6h；
d.将时效处理后的铝、锌、镁、铜7000系合金厚板自然冷却到常温后，加工成试样，在电子万能试验机4上拉伸，测出抗拉强度、屈服强度和伸长率；同时在光学显微镜5下进行显微组织的观察并检测晶粒的变化；在电导率仪6中进行电导率的测定。对测出的各项数据进行判断，确定产品是否合格。
上述方法采用分级时效制度后，强度和塑性都有大幅度的增加。 

Claims (1)

1.一种铝、锌、镁、铜7000系合金厚板分级时效处理方法，其特征在于采取以下步骤：
a.将铝、锌、镁、铜7000系合金厚板放到箱式淬火炉（1）中进行淬火处理，淬火温度升温到477±3℃，保持时间为80~100min；淬火转移时间t1≤30~50s；
b.淬火处理后的铝、锌、镁、铜7000系合金厚板，在水冷却容器（2）中冷却；
c.将冷却后的铝、锌、镁、铜7000系合金厚板放到时效炉（3）中进行分级时效处理，第一级时效温度120±3℃，保持时间为4~6h；第二级时效温度155±3℃，保持时间为24~28h；第三级时效温度120±3℃，保持时间4~6h；
d.将时效处理后的铝、锌、镁、铜7000系合金厚板自然冷却到常温后，加工成试样，在电子万能试验机（4）上拉伸，测出抗拉强度、屈服强度和伸长率；同时在光学显微镜（5）下进行显微组织的观察并检测晶粒的变化；在电导率仪（6）中进行电导率的测定。
CN201410032473.XA 2014-01-24 2014-01-24 铝、锌、镁、铜7000系合金厚板分级时效处理方法 Pending CN104313520A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104846302A (zh) * 2015-06-02 2015-08-19 湖南大学 一种保持铝合金强度降低淬火残余应力的时效热处理方法
CN114134436A (zh) * 2021-11-01 2022-03-04 湖南中创空天新材料股份有限公司 一种提升7xxx系铝合金应力腐蚀抗力的形变热处理方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477292A (en) * 1973-10-26 1984-10-16 Aluminum Company Of America Three-step aging to obtain high strength and corrosion resistance in Al-Zn-Mg-Cu alloys
US4863528A (en) * 1973-10-26 1989-09-05 Aluminum Company Of America Aluminum alloy product having improved combinations of strength and corrosion resistance properties and method for producing the same
CN101724797A (zh) * 2009-12-01 2010-06-09 中南大学 Al-Zn-Mg-Cu系合金的固溶热处理方法及用该方法处理的铝合金
CN102134671A (zh) * 2000-12-21 2011-07-27 阿尔科公司 铝合金产品及人工时效方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477292A (en) * 1973-10-26 1984-10-16 Aluminum Company Of America Three-step aging to obtain high strength and corrosion resistance in Al-Zn-Mg-Cu alloys
US4863528A (en) * 1973-10-26 1989-09-05 Aluminum Company Of America Aluminum alloy product having improved combinations of strength and corrosion resistance properties and method for producing the same
CN102134671A (zh) * 2000-12-21 2011-07-27 阿尔科公司 铝合金产品及人工时效方法
CN101724797A (zh) * 2009-12-01 2010-06-09 中南大学 Al-Zn-Mg-Cu系合金的固溶热处理方法及用该方法处理的铝合金

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104846302A (zh) * 2015-06-02 2015-08-19 湖南大学 一种保持铝合金强度降低淬火残余应力的时效热处理方法
CN114134436A (zh) * 2021-11-01 2022-03-04 湖南中创空天新材料股份有限公司 一种提升7xxx系铝合金应力腐蚀抗力的形变热处理方法

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Application publication date: 20150128