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US 4,377,622 AGranted
Method for producing compacts and cladding from glassy metallic alloy filaments by warm extrusion
AssigneeGeneral Electric Company
InventorHoward H. Liebermann
Life of this patent
Estimating the term…
Abstract
Filaments of glassy metallic alloys prepared by chill block melt-spinning are consolidated under heat and pressure by an extrusion process. Products obtainable by the process include discrete bodies of glassy metallic alloys of substantially uniform composition and articles having one or more layers of glassy metallic alloy clad onto one or more non-glassy metallic alloy substrates.
Claims34
The method for consolidating glassy metallic alloy in filamentary form comprising the steps of:
- (a) preparing an assembly of at least an outer metallic container having one end open and a preselected amount of intertwined filamentary glassy metallic alloy disposed substantially uniformly therein and packed to a density of from about 50% to about 60% of theoretical;
- (b) closing said open end by inserting a plunger into said open end forming thereby an extrusion billet;
- (c) heating said extrusion billet to a substantially uniform temperature throughout, said temperature being in the range between the plastic transition temperature and the crystallization temperature of said alloy;
- (d) extruding said billet to reduce the cross section thereof by an extrusion ratio of at least about 3.5 to 1 while maintaining the temperature of said billet at a substantially uniform value throughout in the range between the plastic transition temperature and the crystallization temperature of said alloy;
- and
- (e) recovering an extruded product of reduced cross section in which the contiguous surface areas of said intertwined filamentary glassy metallic alloy have been metallurgically bonded together by the application of inter-filament shearing forces to form a solid dense glassy metallic alloy body surrounded by and metallurgically bonded to said container.
3 more elements
The method for consolidating magnetically soft glassy metallic alloy in filamentary form while substantially maintaining the soft magnetic properties of the alloy comprising the steps of:
- (a) preparing an assembly comprising at least an outer metallic container having one end open and a preselected amount of magnetically soft intertwined filamentary glassy metallic alloy disposed loosely and substantially uniformly therein by preheating said alloy to a temperature in the range between the plastic transition temperature and the crystallization temperature of said alloy and disposing said alloy in said container without causing heterogeneous plastic flow of said alloy, said container being maintained at a substantially uniform temperature throughout in the range between the plastic transition temperature and the crystallization temperature of said alloy;
- (b) closing said open end by inserting a plunger preheated to a temperature in the range between the plastic transition temperature and the crystallization temperature of said alloy into said open end without compressing said magnetically soft filamentary alloy disposed therein to form an extrusion billet;
- (c) extruding said heated billet to reduce the cross section thereof by an extrusion ratio of at least about 3.5 to 1 while maintaining the temperature of said billet at a substantially uniform value throughout in the range between the plastic transition temperature and the crystallization temperature of said alloy;
- and
- (d) recovering an extruded product of reduced cross section in which the contiguous surface areas of said interwined filamentary magnetically soft glassy metallic alloy have been metallurgically bonded together by the application of inter-filament shearing forces to form a solid dense magnetically soft glassy metallic alloy body and in which the surface areas of said intertwined filamentary magnetically soft glassy metallic alloy contiguous with said container have been metallurgically bonded to said container by said shearing forces.
2 more elements
Dependencies are inferred from the claim text.