• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (10): 19-24.

• 论文 • 上一篇    下一篇

AA6016铝材烘烤硬化性能研究

盈亮;申国哲;胡平;王安东;马宁;常颖   

  1. 大连理工大学工业装备结构分析国家重点实验室;大连理工大学汽车工程学院
  • 发布日期:2011-05-20

Research on Bake Hardening Behavior of AA6016 Aluminum Alloy Sheets

YING Liang;SHEN Guozhe;HU Ping;WANG Andong;MA Ning;CHANG Ying   

  1. State Key Laboratory of Structural Analysis for Industrial Equipment School of Automotive Engineering, Dalian University of Technology
  • Published:2011-05-20

摘要: 以两种新型汽车车身用AA6016铝合金为研究对象,对比研究其力学性能及不同人工时效制度下的烘烤硬化性。探讨各工艺参数影响下的微观机理,提出优化的烘烤工艺流程:固溶淬火+预时效+自然时效+人工时效(烘烤硬化)。研究表明:铝材烘烤硬化主要是由亚稳强化相′′的沉淀析出以及预变形产生的位错强化引起,烘烤硬化值大小与合金中′′相形核速度有关,不同的自然时效状态及板材轧制特性不影响烘烤硬化的实际效果。尽可能采用高温短时效的烘烤过程(2%~3%预变形,170~180 ℃,小于30 min)可使AA6016铝合金获得满意的烘烤硬化效能。该过程可大幅提升AA6016铝合金烘烤硬化性和成形性,烘烤硬化值为40~90 MPa,对企业实际应用具有指导意义。

关键词: AA6016铝合金, 车身板, 工艺参数, 烘烤硬化, 人工时效

Abstract: The mechanical property and bake hardening behavior of two new-type automotive body AA6016 aluminum alloys under different artificial ageing processes are investigated comparatively, and the interrelated micro-mechanism is discussed. The optimal process is as follows:Solution hardening + pre-ageing + natural ageing + artificial ageing (bake hardening), which conduces to strengthening bake hardening. The results indicate that the bake hardening of aluminum alloy is mainly caused by the metastable precipitation of ′′ phase and the dislocations strengthening resulting from pre-deformation. The BH value is insensitive to natural ageing and rolling conditions, which couples with the speed of ′′ phase nucleation. The short-time baking process with high-temperature(2%~3% pre-deformation,170~180 ℃,less than 30 min) contributes to obtaining good bake hardening properties, the yield stress enhances 40~90 MPa. It is a good treatment schedule to promote the bake-hardening and formability of AA6016 aluminum alloys, which has guiding significance to practical application by enterprises.

Key words: AA6016 aluminum alloy, Artificial ageing, Automotive panel, Bake hardening, Process parameter

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