Abstract
Vacuum extraction gas analyses were carried out on aluminum specimens involving a number of pores and Al-4%Mg alloy specimens enclosed in a metal capsule. The metal capsule prevents an extraction tube from contamination caused by magnesium vaporization both in vacuum heat and fusion extractions without disturbing a gas extraction process. Hydrogen dissolved in solid magnesium is extracted within 1hr at 500°C without contamination of the tube. Contamination of the tube occurs at 550°C or more. The hydrogen diffusivity in solid magnesium enclosed in the metal capsule was measured by the vacuum extraction method; D=2.56×103exp (-21, 300/RT)
