Table A2: Specific design targets for Project A4
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Project A4: Semi-solid Processing and Morphous/Nanocrystalline Light Alloys | |||||
| Project Leader: Professor Michael Ferry | ||||||
| Materials such as lightweight bulk metallic glasses (BMGs) possess many attractive properties suitable for structural, mechanical and functional applications. These materials can be: (i) cast in thick sections by conventional routes; (ii) processed in the semi-solid state to generate BMG composites, and (iii) thermoplastically formed in the supercooled liquid (SCL) region. For the latter, desirable shaped components can be produced using both established and emerging techniques such as micro- and nano-replication, extrusion, forging and blow moulding. | ||||||
| This project is concerned with alloy design and the control casting parameters and formability in the SCL region for producing BMG alloy and composites components for specific end applications. The project involves three major streams of research (Table A2): (i) stream A aims to extend the types of BMG compositions based on a fundamental approach to alloy design; (ii) stream B aims to generate actual devices and components suitable for certain end-applications, and (iii) Stream C aims to generate both monolithic alloy and BMG composite components via semi-solid processing. | ||||||
Table A2: Specific design targets for Project A4 |
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| Stream | A: Fundamentals of formation of BMGs and their composites | B: Casting and solid-state processing of BMG components & devices | C: Semi-solid processing of net-shape light alloy components | |||
| Title | Synthesis and properties of BMGs | Production of high-strength biocompatible BMG components | Development of high-strength, formable BMG composites | Development of high-strength, high ductility BMG composites | ||
| Major Design Target | Basic understanding of glass forming ability and prediction of new classes of BMGs and their composites | Fabrication of a high-strength biocompatible & biodegradable BMG devices and components | BMG composites competitive with CFRPs and CFR MMCs and those with enhanced plasticity below Tg | BMG composites exhibiting strength and ductility comparable to conventional high strength steels and titanium alloys | ||
| Quantitative performance goals | Fundamental studies of BMG development and nucleation and growth phenomena in both the liquid- and solid-states | Biocompatibility: Strict control of alloying elements | Strength, stiffness & ductility: > 2000 MPa, 140 GPa and>4% (BMG-CFR) | Strength, stiffness & ductility: > 1500 MPa and >10% (for Mg-base BMG composites) | ||
| Processing: Formable in the SCL region | Density: 1.9-2.5 g/cm3 | Density: < 5 g/cm3 | ||||
| Strength, stiffness & ductility: > 800 MPa, 70 GPa and >4% | Processing: Formable in the SCL region | Processing: Semi-solid production into net-shape components | ||||
| Corrosion rate: Tailored dissolution rates | Thermal Stability: Stable up to Tg | Thermal Stability: Stable up to Tg | ||||
| Production costs: competitive with current bio-implant materials | Production costs: competitive with regular CFR MMCs | Production costs: competitive with current high strength alloys | ||||
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