氧化涂层与基体临界失效应力的扫描电镜原位试验研究（英文）

发布时间：2018-01-17 17:09

本文关键词：氧化涂层与基体临界失效应力的扫描电镜原位试验研究（英文）　出处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2016年01期 　论文类型：期刊论文

【摘要】：目的:以典型的氧化涂层-AZ91D基体材料为背景,开展涂层-基体结构的损伤行为研究,在扫描电镜原位试验基础上定量地评价这种结构材料的临界弯曲失效应力值。创新点:在Stoney方程基础上首次用试验方法定量地表征氧化涂层与镁铝合金基体材料的弯曲失效应力值;建立梁或板最大弯曲扰度与临界失效应力之间的关系,弥补Stoney方程中没有考虑二维效应及涂层材料特性引起的不足,使之更加适合工程中常见涂层-基体结构的损伤特点。方法:将如图1所示的涂层-基体结构试件断面仔细抛光后置于扫描电镜的真空腔内;边加载边观察断面中损伤行为的变化,特别是界面附近的变形和开裂状态;比较所对应的加载点位移和载荷大小,并把其作为评价损伤行为的力学参数。结论:本试验方法定量表征的涂层-基体结构临界弯曲失效应力值和失效位置与扫描电镜损伤演化图形的数字散斑分析结果一致,适合二维涂层-基体结构损伤应力的评价。
[Abstract]:Objective: to study the damage behavior of coating matrix structure based on typical oxidation coating AZ91D. The critical bending failure stress of this structural material is quantitatively evaluated on the basis of in situ test of scanning electron microscope. On the basis of Stoney equation, the bending failure stress of oxidation coating and magnesium aluminum alloy substrate was quantitatively characterized by the experimental method for the first time. The relationship between maximum bending disturbance and critical failure stress of beam or plate is established to make up for the deficiency caused by the non-consideration of two-dimensional effect and the characteristics of coating material in Stoney equation. Methods: the section of the coating-matrix structure was carefully polished and placed in the vacuum cavity of the scanning electron microscope (SEM). While loading, the damage behavior of the section is observed, especially the deformation and cracking state near the interface. The corresponding load point displacement and load size are compared. It is regarded as a mechanical parameter to evaluate the damage behavior. The critical bending failure stress and failure position of the coating matrix structure quantitatively characterized by this method are in agreement with the results of the digital speckle analysis of the damage evolution pattern of scanning electron microscope (SEM). It is suitable for the evaluation of damage stress of two-dimensional coating-matrix structure.
【作者单位】： Applied
【基金】：supported by the National Natural Science Foundation of China(Nos.11272173 and 11572170) the Foundation of Traction Power State Key Laboratory of Southwest Jiaotong University(No.TPL1503),China
【分类号】：O344.1
【正文快照】： 1 IntroductionLight metals,such as magnesium and aluminumalloys,are very attractive structural materials forachieving high performance and energy savings inmachines and structures.This is because of their ad-vantages,such as a high strength to weight rat

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