CREEP-RESISTANT MAGNESIUM ALLOYS FOR NUCLEAR FUEL ELEMENTS
An investigation was made of the creep properties at 450 to 500 deg C of extruded magnesium--base magnesium-manganese and magnesium- zirconium-- manganese alloys with a view to their application as lightiy stressed structural components. Binary alloys containing 0.75 to 1.0% manganese (AM5O3S) exhibit a high creep strength at low stresses only if submitted to a grain-coarsening treatment. This, however, results in poor rupture ductility; at higher stresses a better ductility, accompanied by a marked loss in creep strength, is found. When the manganese content is raised to 1.5% (AM503), a very high creep-resistance at 450 deg C is obtained in the as-extruded condition at a relatively small grain size. In ternary alloys containing 0.2 to 0.7% zirconium, 0.1% manganese imparts high creep strength at 450 deg C but results in a relatively poor creep strength at 500 deg C, which cannot be substantially improved by heat-treatment. A 0.3% manganese content imparts high creep-resistance at 500 deg C; the best alloy is one that contains 0.7% zirconium. At high temperatures, the ternary alloys possess a relatively stable grain size and highrupture ductility. (auth)
- Research Organization:
- Associated Electrical Industries (Rugby) Ltd., Aldermaston, Berks, Eng.
- NSA Number:
- NSA-14-025973
- OSTI ID:
- 4131849
- Journal Information:
- J. Inst. Metals, Journal Name: J. Inst. Metals Vol. Vol: 88
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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