Shear-Assisted Extrusion for Direct Powder Billet Forming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing manufacturing methods for materials like magnesium and aluminum alloys are inefficient, costly, and require extensive processing steps, leading to issues such as brittle intermetallic layers and high energy consumption, limiting their use in applications like automotive and aerospace components.
Innovation Solution
The Shear-Assisted Processing and Extrusion (ShAPE) technique uses a rotating ram and die to apply both rotational shearing and axial forces, allowing direct extrusion from billets, powders, or flakes without pre-heating, reducing energy consumption and eliminating brittle intermetallic layers, and enabling control over grain size and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional extrusion methods are used for magnesium and aluminum alloys, then the manufacturing process is established and reliable, but the process requires extensive processing steps, pre-heating, and generates brittle intermetallic layers with high energy consumption
Solution Approach 1:
The patent applies severe plastic deformation parameters (extreme shear strain, high strain rate) during extrusion to fundamentally change the material processing regime. This enables direct extrusion from as-cast billets without pre-heating, reducing energy consumption by up to 10 times while eliminating brittle intermetallic layers through intensive shear mixing that creates homogeneous microstructures
Solution Approach 2:
The patent eliminates the preliminary pre-heating step by designing an extrusion process that can directly process as-cast billets. The severe plastic deformation during extrusion itself provides the necessary material softening and homogenization, removing the need for separate pre-heating operations and reducing overall energy consumption
2Device complexity
If conventional extrusion methods are used, then the process is simpler in terms of equipment, but the production of hollow sections with desired grain structure requires additional processing steps
Solution Approach 1:
The patent combines multiple functions into a single extrusion operation: shaping the hollow section, refining the grain structure through severe plastic deformation, and homogenizing the microstructure all occur during the same extrusion process. This eliminates the need for separate subsequent processing steps, increasing productivity while using conventional extrusion equipment
Solution Approach 2:
The patent introduces rotational motion (torsional component) to the conventional linear extrusion process. This adds a dimensional aspect to the deformation, creating severe shear strain that refines grain structure and homogenizes the material during extrusion, enabling single-step production of hollow sections with controlled microstructure
3Strength
If rare earth metals are added to magnesium or aluminum alloys to impart desired characteristics, then the material properties are improved, but the production cost increases significantly
Solution Approach 1:
The patent replaces chemical strengthening methods (adding rare earth metals) with mechanical strengthening through severe plastic deformation. The intensive shear strain and high strain rate during extrusion create fine-grained microstructures and homogeneous distributions that provide enhanced mechanical properties without requiring expensive rare earth alloying elements
4Use of energy by moving object
If high speed shear-assisted extrusion is applied, then energy consumption is reduced by up to 10 times and brittle intermetallic layers are eliminated, but the process requires applying both rotational shearing and axial forces simultaneously
Solution Approach 1:
The patent transforms the static conventional extrusion process into a dynamic process by introducing rotational motion of the billet or die. This creates time-varying shear strains that intensify the deformation, reduce energy consumption, and eliminate brittle layers through continuous mixing, while the combined rotational and axial motion is achieved through coordinated control of the extrusion system
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
This method achieves extruded materials with improved strength, ductility, and corrosion resistance, reducing production costs and energy consumption by up to 10 times, enabling lightweight components with tailored properties for automotive and aerospace applications.
Implementation Method 1
applying a rotational shearing force and an axial extrusion force to the same preselected location on the material
Implementation Method 2
severe plastic deformation
Implementation Method 3
The friction and plastic deformation generate heat at the die-face, plasticizing the material without external pre-heating
Implementation Method 4
The friction and plastic deformation generate heat at the die-face
Data Source
AI summary
A method for preparing a shear-assisted extruded material from a powder billet is provided, the method comprising providing a billet of material in substantially powder form; applying both axial and rotational pressure to the material to deform at least some of the contacted material; and extruding the material to form an extruded material. A method for preparing shear-assisted extruded material is provided, the method comprising applying both axial and rotational pressure to stock material to form an extruded material at a rate between 2 and 13 m/min. A method for preparing shear-assisted extruded material is provided. The method comprises applying both axial and rotational pressure to stock material to form an extruded material; and aging the extruded material for less than 3 hours. A method for preparing shear-assisted extruded material is provided. The method comprises providing a stock material for shear-assisted extrusion; and applying both axial and rotational force to the stock material to form an extruded material, wherein the axial force does not decrease during the extrusion.