This paper describes the hydrogen embrittlement (HE) o f an A1-Li alloy aged a t 190°C and with d i f f e r e n t durations o f ageing (10, 15, 20 and 30 hr). Two techniques were employed t o measure HE : a) cathodic polarization i n a molten salts bath with-3 VIAg on tensile specimens ; b) gaseous hydrogenation on disks. Hydrogen charging was achieved a t 190°C. The results show that HE i s important when the a1 1 oy i s i n the over-aged condition.
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