a level of about 0 1 to 2 3 weight percent of hydrogen hydrogenation is conducted in a suitable closed apparatus at an elevated temperature by admitting sufficient hydrogen to attain the desired concentration of hydrogen in the alloy the hydrogenation step is conducted at a temperature of about 50 to 96 of the beta transus temperature of the alloy heating of the article to the desired temperature is conducted under an inert atmosphere when the hydrogenation temperature is reached hydrogen is added to the atmosphere within the apparatus the partial pressure of hydrogen added to the atmosphere and the time required for hydrogenation are dependent upon such factors as the size and cross section of the article the temperature of hydrogenation and the desired concentration of hydrogen in the article after hydrogenation the admission of hydrogen to the apparatus is discontinued and the apparatus is flushed with a non flammable mixture of inert gas and about 4 hydrogen the article is allowed to equilibrate at the hydrogenation temperature for about 10 to 20 minutes and then furnace cooled dehydrogenation is accomplished by heating the article under vacuum to a temperature of about 50 to 96 of the beta transus temperature of the alloy the time for hydrogen removal will depend on the size and cross section of the article and the volume of hydrogen to be removed the time for dehydrogenation must be sufficient to reduce the hydrogen content in the article to less than the maximum allowable level for the alloy ti 6al 4v the final hydrogen level must be below 120 ppm 0 012 weight percent to avoid degradation of physical properties such as room.