Behaviour of hydrogen in pure aluminium, Al-4 mass% Cu and Al-1 mass% Mg2Si alloys studied by tritium electron microautoradiography
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The effect of lattice defects and microstructures on hydrogen distribution in pure aluminium, Al-4 mass% Cu and Al-1 mass% Mg2Si alloys has been studied by tritium electron microautoradiography. It was found that in pure aluminium and both the alloys, dislocations and grain boundaries act as short-circuiting diffusion paths and also as trapping sites for hydrogen. It was found that the Guinier-Preston (GP) zones in the Al-1 mass% Mg2Si alloy do not act as trapping sites but as repellants for hydrogen, in contrast to the GP zones in the Al-4 mass% Cu alloy in which they act as trapping sites for hydrogen. In the Al-1 mass% Mg2Si alloy, the interfaces between the matrix lattice and the metastable β′ precipitate and between the matrix lattice and the equilibrium β precipitate, were proved to be strong trapping sites for hydrogen. In the Al-4 mass% Cu alloy, the equilibrium θ precipitate itself has been found to be able to trap hydrogen.
KeywordsHydrogen Polymer Microstructure Tritium Material Processing
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