dr. alagiriswamy a a , (m.sc, phd, pdf) asst. professor (sr. grade),
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Dr. Alagiriswamy A A , (M.Sc, PhD, PDF) Asst. Professor (Sr. Grade), Dept. of Physics & Nanotechnology, SRM-University, Kattankulathur campus, Chennai. UNIT III. Lecture 2. Mar. 18/2014. Outline. Shape memory alloys (SMAs) Metallic glasses or amorphous metals - PowerPoint PPT PresentationTRANSCRIPT
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Dr. Alagiriswamy A A, (M.Sc, PhD, PDF)Asst. Professor (Sr. Grade),
Dept. of Physics & Nanotechnology, SRM-University,
Kattankulathur campus, Chennai
Mar. 18/2014
UNIT III
Lecture 2
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Shape memory alloys (SMAs)
Metallic glasses or amorphous metals
examples, features, preparation, applications
Composites
Features, examples, products
Advanced ceramics
Examples Categories, preparation (processing techniques) properties features, examples
Outline
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Stents as SMAs
Before I proceed
Ability to bend, stay bent, and regain its shapeUses internal atomic arrangement to recognize their shapesAustentite (high temperature cubic phase) & Martensite (low temperature deformed or twinned phase)
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Metallic Glass: A Revolution of Metallurgy
• Metallic glass = Amorphous metal– Metals (have long range order, ductility, malleability, lusture)– Glasses (lack of long range order – short range order, no
crystallinity features )– It's called metallic glass, and it shines like a mirror, but when
you drop a piece of it to the floor, it doesn't break. In fact, it bounces--wildly--thanks to its unusual atomic structure
– can it be called as a liquid metal – Conventional metals crystallize when cooled from a liquid to a
solid. But metallic glass cools to an amorphous (glassy) structure, making it much stronger, lighter, and springier than other metals--and virtually corrosion-proof
– low hysteresis (may be a soft magnetic)
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
X-ray spectrum of ………..
(a) crystalline material and (b) amorphous material
,,, 114186710137720 SiBCOFeBSiFeB21734741843840 , SiBMONiFeBMONiFe
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
(a) Mechanical properties
Unique features of MG………..
(b) Magnetic properties
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
More interesting features of MG ……
• Imagine a razor blade that stays super sharp
for a year.
• A golf club so springy it can drive a ball farther
than a titanium club.
• An artificial hip implant that is stronger and
more flexible than current implants.
• A cell phone case that is almost indestructible
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Fabrication of MG …
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Advanced Ceramic Materials
• Non-metallic elements, need not be inorganic
• Hard and brittle, toughness,
• Chemically inert, having high melting points
• Electrically/thermally considered to be insulators
Ceramic materials
Traditional ceramics (bricks, porcelain)
Advanced ceramics (SiC, Si3N4, Al2O3)
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
A few applications of Adv. Cer…..
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Comparison metals v ceramics
Ceramics Metals
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Processing of advanced ceramics
• Material preparation– Milling/sizing to form desired particle size
• Forming or casting– Pressing into a die – to form a shaped product
• Thermal treatment– Drying: to remove water from the plastic and the
process is carried out in the range 200 to 3000C.– Sintering: small particles of a material bonded
together - solid-state diffusion. During this process ceramic porous product is made into a dense coherent product.
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Composites
A composite is basically a material that contains both a
reinforcing material to provide strength and stiffness and a
matrix material to surround and hold the reinforcement
together.
• Natural composites:– Wood (cellulose/lignin)– Bone (apatite/collagen)– Nacre ( Mother of pearl)
(Aragonite/protein) – Granite (quartz, feldspars…)
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
• Engineered materials – (reinforcing phase, matrix phase)– Orthotropic :- depends on the direction of
the external load applied– Difficult to explain the mechanical
properties– Shock/impact creates failure at
micro/macro level– Fiber reinforced, glass reinforced, carbon
reinforced composites
features
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
What are the advantage of composites ?
• Light weight
• High strength & stiffness
• Reinforcement fibres can be arranged to follow the direction of principle loads and stresses
• Good fatigue resistance
• Very low coefficient of thermal expansion
• Good environmental and corrosion resistance
• The ability to manufacture complex shapes by moulding results in cost-effective production
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Applications as
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Applications as
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
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Dr. Alagiriswamy A A, Asst. Professor, Dept. of Physics, SRM-U, Chennai
Thanks for the kind attention