采用硬质阳极氧化技术为6061蜂窝制备了54μm厚的Al2O3硬质涂层,并采用X射线衍射技术测试了不同热载荷后合金表面的残余应力.之后利用扫描电镜对不同热载荷涂层的截面形貌进行了表征,研究了热载荷对涂层和基体残余应力的影响,并基于理论模型对这种残余应力进行了估算.不同热载荷条件下基体表面的残余应力值与估算结果吻合较好.研究结果表明:涂层由γ-Al2O3物相组成;在400 ～500℃范围内,随着热载荷温度的增加,涂层处的裂纹增加,但涂层与基体结合良好;600℃后涂层出现大量裂纹,并且在界面处出现严重的脱层现象.
A 6061 alloy honeycomb with 54 μm thick Al2O3coatings was prepared by the hard anodic oxidation technique,and then the thermal residual stresses were measured by X-ray diffraction (XRD) method.The section morphology of the coating was characterized by scanning electron microscopy and optical microscope.The influence of thermal loads on the residual stress in both the coating and substrate was investigated via both experiment and theoretical methods.The residual stresses obtained from the XRD technology show good agreement with the estimated results from the theoretical model.The results show that the coating is composed of γ-Al2O3.In the range of 400 ℃ to 500 ℃,as the temperature increases,the crack number in the coating increases,but the interface between the coating and the substrate is still perfect.As the temperature reaches 600 ℃,a large number of cracks are found near the interface,and delamination failure occurs at the same time.
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