Effect of Heat Treatment on Stress Corrosion Cracking Behavior on 2024 Aluminum Alloy in Chloride Solution

  • 來 莎莉

Student thesis: Master's Thesis

Abstract

Due to good strength and weight ratio 2024 aluminum alloy widely used in aerospace industry This type of aluminum alloy is a heat treatable alloy Nevertheless 2024 aluminum alloy was reported susceptible to several types of corrosions including stress corrosion cracking (SCC) Therefor to understand the stress corrosion cracking behavior of this alloy several types of experiments were being conducted using Stress corrosion cracking testing on uniaxial load as a primary technique then metallography analysis Scanning Electron Microscope (SEM) and electro-chemical testing As for the heat treatment the specimen was heated until 495°C then water quench and natural aging in room temperature for 96 hours 0 1 M NaCl with concentration of acidity of 2 8 and 6 solution was being used as the corrosive environment during the stress corrosion cracking testing The load that being applied on the testing were 300 MPa and 340 MPa The metallography analysis showed that the microstructure of this alloy contained mostly of Al2CuMg (S-phase) On the other hand the SEM image analysis testing on the heat treated materials showed more severe inter-granular cracking and uniform surface corrosion compared to as-received materials indicating the initial stage of stress corrosion cracking As the depth increase the cracking then transform into finer inter-granular cracking
Date of Award2016 Aug 31
Original languageEnglish
SupervisorWen-Ta Tsai (Supervisor)

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