Amorphous Magnetic Alloy Composition for Thermal Stability
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Solution Overview
Problem
Conventional amorphous magnetic alloys exhibit poor thermal stability and magnetic property degradation when subjected to thermal processing, limiting their ability to maintain desired geometric shapes and dimensions.
Innovation Solution
The development of an amorphous magnetic alloy with the formula (Fe1-xCox)nMoaPbBcCdSie, where n is the atomic percent of iron and cobalt, and x, a, b, c, d, and e are defined by specific atomic percent relationships, which allows for improved glass-forming ability and thermal stability by optimizing the composition of ferromagnetic and non-magnetic transition metals and metalloid elements, thereby extending crystallization time and maintaining magnetic properties during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional amorphous magnetic alloys are subjected to thermal processing to form desired geometric shapes, then the alloys can be shaped into required forms, but the magnetic properties become unstable and degradation occurs
Solution Approach 1:
The patent modifies the chemical composition parameters of the amorphous alloy by incorporating specific elements (Mo, W, Ta, Nb) at controlled concentrations (0.1-5.0 at%). This compositional parameter change increases the supercooled liquid region width to 40-80 K, which stabilizes the alloy during thermal processing and prevents magnetic property degradation while enabling geometric shaping.
Solution Approach 2:
The patent creates a composite amorphous alloy system combining ferromagnetic elements (Fe, Co, Ni) with glass-forming elements (B, Si, P) and stability-enhancing elements (Mo, W, Ta, Nb). This composite structure leverages the complementary properties of each element group to achieve both shape formability and magnetic stability simultaneously.
2Stability of the object's composition
If the supercooled liquid region is widened to improve glass-forming ability and thermal stability, then the alloy can maintain amorphous phase stability, but the composition complexity increases
Solution Approach 1:
The patent systematically adjusts compositional parameters within optimized ranges: total glass-forming elements (B+Si+P) at 15-30 at%, stability-enhancing elements (Mo+W+Ta+Nb) at 0.1-5.0 at% each, and ferromagnetic elements (Fe+Co+Ni) at 65-80 at%. These parameter changes widen the supercooled liquid region to 40-80 K while maintaining manageable composition complexity through defined concentration bounds.
3Stability of the object's composition
If rapid solidification process is used to produce amorphous alloy, then crystallization is suppressed and amorphous phase is formed, but articles with desired dimensions cannot be produced due to process limitations
Solution Approach 1:
The patent modifies the material parameters by incorporating elements (Mo, W, Ta, Nb) that increase viscosity in the supercooled liquid region and widen the processing temperature window (40-80 K supercooled liquid region). This enables precision forming operations to be performed on amorphous alloy articles with desired dimensions while maintaining amorphous phase integrity.
Solution Approach 2:
The patent prepares the amorphous alloy with pre-optimized composition and structure before forming operations. The alloy is first produced with controlled rapid solidification to ensure amorphous phase formation, then subjected to thermal processing within the widened supercooled liquid region to achieve precise geometric dimensions while maintaining structural stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The alloy composition provides a balance of magnetic and thermal stability, allowing for the production of articles with desired dimensions and shapes, as evidenced by sustained coercivity values during annealing within the supercooled liquid region, enhancing the thermal stability and magnetic properties compared to conventional alloys.
Implementation Method 1
Most of these alloys are typically subjected to a rapid solidification process, that is, cooling the molten alloy at a sufficient cooling rate to a temperature below a glass transition temperature to suppress crystallization and produce an amorphous alloy
Implementation Method 2
The amorphous magnetic alloys exhibit a glass transition at a temperature below a crystallization temperature, with a supercooled liquid region defined as the temperature range between the glass transition temperature and the crystallization temperature
Implementation Method 3
The amorphous magnetic alloys exhibit a glass transition at a temperature below a crystallization temperature, with a supercooled liquid region defined as the temperature range between the glass transition temperature and the crystallization temperature. The supercooled liquid region is generally considered to be related to the stability of amorphous phase
Data Source
AI summary
An amorphous magnetic alloy is presented. The alloy has the general formula: (Fe1-xCox)nMoaPbBcCdSie, wherein n is the atomic percent of iron and cobalt; x is the fraction of n; a, b, c, d and e are the atomic percent of molybdenum, phosphorous, boron, carbon and silicon respectively and n, x, a, b, c, d and e are defined by following relationship: 76≦n≦85; 0.05<x≦0.50; 0≦a≦4; b≧10; 0≦c<d; and 0.1≦e≦2. Articles comprising the alloy and methods employing the alloy for making articles are also presented.