Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第4期    总第253期    2020年4月

[PDF全文下载]        

    

文章编号:1004-0609(2020)-04-0750-13
停放时间对6061铝合金性能及微观组织的影响
寇琳媛1, 2,王 冠1, 2,马 超1,卞东伟1

(1. 宁夏大学 机械工程学院,银川 750021;
2. 宁夏大学 宁夏智能装备CAE重点实验室,银川 750021
)

摘 要: 采用宏观检测与显微分析相结合的手段,研究不同停放时间下6061铝合金的力学性能与微观组织的变化规律。结果表明:停放时间对6061铝合金的晶粒尺寸有较大影响,晶粒尺寸呈先增大后减小的趋势;停放时间对6061铝合金弹塑性变形过渡阶段有较大影响,但对弹性及塑性阶段变形的影响很小。6061铝合金在停放为0~2 h时,力学性能无明显变化,变形后试样表面光滑,变形协调性较好;停放时间为12 h时,材料的抗拉强度和屈服强度降至最低,但伸长率提高,试样表面呈橘皮形貌,变形均匀性较差;停放时间为24 h~15 d时,合金的强度回升并逐渐趋于稳定。结果表明:随着停放时间的增长,6061铝合金断口的韧窝直径和深度不断增加,第二相粒子的尺寸也不断增大,形状由球状、带状逐渐转变为板状、块状。通过研究得到6061铝合金满足汽车结构强韧化需求,综合性能最优需求的停放时间为12~24 h。此研究结果能够为6061铝合金加工工艺优化提供理论指导。

 

关键字: 6061铝合金;停放时间;力学性能;微观组织

Influence of quench delay time on mechanical properties and microstructure of 6061 aluminum alloy
KOU Lin-yuan1, 2, WANG Guan1, 2, MA Chao1, BIAN Dong-wei1

1. School of Mechanical Engineering, Ningxia University, Yinchuan 750021, China
2. Ningxia Key Laboratory of computer Aided Engineering Technology for Intelligent Equipment, Ningxia University, Yinchuan 750021, China

Abstract:The dependence of the mechanical properties and microstructure of 6061 aluminum alloy under different quench delay time were investigated by the combination of macro-detection and micro-analysis. The results show that the quench delay time has a great influence on the grain size of 6061 aluminum alloy, and the grain size increases first and then decreases. The quench delay time has a great influence on the elastic-plastic transition deformation of 6061 aluminum alloy, but has little effect on the elastic deformation. The 6061 aluminum alloy has no obvious change in mechanical properties during quench delay time of 0-2 h. After deformation, the surface of the specimens is smooth and the deformation coordination is better. When the quench delay time is 12 h, the tensile strength and yield strength of the material are minimized, but the elongation increases. Meanwhile, the surfaces of the specimens show the appearance of orange peel and the deformation uniformity is poor. When the quench delay time is 12 h-15 d, the strength of the alloy rises and gradually stabilizes. The results of microscopic analysis show that, with the increase of quench delay time, the diameter and depth of the dimples of the 6061 aluminum alloy fracture increase, and the sizes of the second phase particles also increase. The shapes gradually change from spheres and ribbons to plates and blocks. The optimal quench delay time of 6061 aluminum alloy is 12-24 h. The research results can provide theoretical guidance for the optimization of 6061 aluminum alloy processing technology.

 

Key words: 6061aluminum alloy; quench delay time; mechanical properties; microstructure

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com