IMPROVEMENTS IN OR RELATING TO MAGNESIUM BASE ALLOYS CONTAINING MANGANESE
A magnesium--manganese alloy treatment is described which results in wrought products with large resistance to grain growth on subsequent annealing or operation at high temperatures. The treatment consists of a solution heat treatment of the cast billet for 2 to 6 hr at 550 to 580 deg C prior to extrusion or other plastic deformation at 275 to 350 deg C to form the products. This treatment may be used with alloys containing 0.3 to 3.5% manganese, and other metals which improve the alloy properties may be added, e.g., up to 0.2 wt.% zirconium, which refines the grain, or cerium, which improves the creep resistance. An example of this treatment is given in which one of two billets of an alloy containing 0.77% manganese was solution heat treated and then cooled slowly while the other billet was not. After extrusion into bars, the average grain size was determined to be 0.40 and 3.9 mm for the bars from the treated and untreated billets, respectively. (D.L.C.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-007742
- OSTI ID:
- 4115362
- Report Number(s):
- GB 858200
- Country of Publication:
- United Kingdom
- Language:
- English
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