An investigation was undertaken to obtain an improvement in the nigh—temperature properties and resistance to creep of magnesium-cerium forging alloys. From preliminary tests, it was decided that the best combination of tensile properties at room temperature and at 600° F, as well as maximum resistance to creep, was produced by the extrusion of a 27/8 -inch billet to 3/4 inch at 1000° F, at a speed of 4.11 inches per o minute, followed by a solution heat treatment and an aging treatment. Also as a result of these tests, a magnesium-ceriumr-manganese alloy containing 6 percent cerium and 2 percent manganese was chosen as the base composition for the experimental alloys.
展开▼
