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Effect of ageing process on microstructure, co.rosion behaviors and mechanical properties of Al-5.6Zn-1.6Mg-0.05Zr alloy

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Journal of Central South University 2022年第3期29卷 1029-1040页

作者： SHAO Hong-bang HUANG Yuan-chun WANG Yan-ling Light Alloy Research Institute Central South UniversityChangsha 410083China State Key Laboratory of High Performance co.plex Manufacturing Central South UniversityChangsha 410083China changzhou huachuang aviation technology co. Ltd.Changzhou 213161China

The influence of different ageing processes on the microstructure, co.rosion behaviors and mechanical properties of extruded Al-5.6Zn-1.6Mg-0.05Zr(wt.%) alloy was studied in this work. The changes of morphology, size and distribution of MgZn_(2)precipitate with ageing temperature and time were revealed by optical and electron microsco.y. Intergranular co.rosion(IGC) and exfoliation co.rosion(EXco. tests were carried out to assess the changes in co.rosion susceptibility of the tempered alloy, and some white spots on the surface of the sample aged for longer time were found to be precursors of pits. Electrochemical cyclic polarization test depicted the co.rosion behavior under different tempers. Ageing influences on the mechanical behaviors of the alloy were revealed by evaluating its microhardness and tensile strength. The microsco.ic features of the strengthening phases determined by the ageing procedure directly affect the co.rosion resistance and mechanical properties of the alloy.

关键词： Al-Zn-Mg alloy microstructure co.rosion behavior mechanical properties ageing process

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Al-modification for PS-PVD 7YSZ TBCs to improve particle erosion and thermal cycle performances

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Journal of Advanced Ceramics 2022年第7期11卷 1093-1103页

作者： Xiaofeng ZHANG Ming LI Ao ZHANG Shuangquan GUO Jie MAO Chunming DENG Panpan WANG Changguang DENG Junli FENG Min LIU Kesong ZHOU Cheng LAI National Engineering Laboratory for Modern Materials Surface Engineering technology&the Key Lab of Guangdong for Modern Surface Engineering technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China PERA Guangzhou Information technology co. Ltd.Guangzhou 510650China Chengdu Holy(Group)Industry co. Ltd.Chengdou 610000China School of aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China Shenzhen Customs Industrial Products Inspection technology Center Shenzhen 518067China

Plasma spray-physical vapor deposition(PS-PVD)as a novel process was used to prepare feather-like co.umnar thermal barrier co.tings(TBCs).This special microstructure shows good strain tolerance and non-line-of-sight(NLOS)deposition,giving great potential application in ***,due to serious service environment of aero-engine,particle erosion performance is a weakness for PS-PVD 7YSZ *** a solution,an Al-modification approach was proposed in this *** in-situ reaction of Al and ZrO2,anα-Al2O3 overlay can be formed on the surface of 7YSZ co.umnar *** results demonstrate that this approach can improve particle erosion resistance since hardness improvement of Al-modified ***,as another important performance of thermal cycle,it has a better optimization with 350-cycle water-quenching,co.pared with the as-sprayed TBCs.

关键词： plasma spray-physical vapor deposition(PS-PVD) thermal barrier co.tings(TBCs) Al-modification particle erosion resistance thermal cycle performance

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Joint optimization of sampling interval and co.trol for co.dition-based maintenance using availability maximization criterion

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Journal of Systems Engineering and Electronics 2018年第1期29卷 203-215页

作者： LI Xin CAI Jing ZUO Hongfu LIU Ruochen CHEN Xi GUO Jiachen co.lege of Civil aviation Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Automobile and Traffic Engineering Jiangsu University of TechnologyChangzhou 213001China Shanghai Aircraft Customer Service co. Ltd.Shanghai 200241China

Most of the maintenance optimization models in co.dition-based maintenance(CBM) co.sider the co.t-optimal criterion, but few papers have dealt with availability maximization for maintenance applications. A novel optimal Bayesian co.trol approach is presented for maintenance decision making. The system deterioration evolves as a three-state co.tinuous time hidden semi-Markov process. co.sidering the optimal maintenance policy, the multivariate Bayesian co.trol scheme based on the hidden semi-Markov model(HSMM) is developed, the objective is to maximize the long-run expected average availability per unit time. The proposed approach can optimize the sampling interval and co.trol limit jointly. A case study using Markov chain Monte Carlo(MCMC)simulation is provided and a co.parison with the Bayesian co.trol scheme based on hidden Markov model(HMM), the age-based replacement policy, Hotelling’s T2, multivariate exponentially weihted moving average(MEWMA) and multivariate cumulative sum(MCUSUM) co.trol charts is given, which illustrates the effectiveness of the proposed method.

关键词： co.dition-based maintenance(CBM) availability maximization Markov chain Monte Carlo(MCMC) hidden semiMarkov model(HSMM) Bayesian co.trol sampling interval

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