METALLIC GLASS
Material Science
INTRODUCTION
• With the advent of material science and so
many new engineering material are
discovered having major application in
industries.
• This are classified as metals and
alloys,cermics,glasses,glass
ceramics,composites and semiconductor.
• Our presentation is on one of such material
which is METALLIC GLASS.
• The material which has the properties of both
metals and glasses is known as metallic glass
or metglass.
• They have high strength,good magnetic
properties and better corrosion resistance.
METALLIC GLASSES
• It shares the property of both metals and
alloys.
• Metallic glasses are metal alloy that are
amorphous.That is they don’t have long range
atomic order.
• The major advantages of such glasses are that
they are generelly homogeneous in
composition,offer strong and superior
corrosion resistance.
BASIC CONCEPT

ΔT = 1,000,000 C / s
(Fe,Co, Ni ) and(B , Si, S, P )
Nickel - Niobium(Ni-Nb)
Magnesium-Zinc (Mg-Zn)
Copper-Zirconium (Cu- Zr)
Hafnium-Vanadium(Hf-V)
PREPARATION
• To have peculiar property, metallic glasses are
to be made by cooling a molten metal rapidly
at rate of 2*1060 c◦/s.
• During the proccess of solidification,atoms do
not have enough time or enegy to rearrange
for crystal nucleation.Thus,li reaching the glass
tranition temperature Tg solidifies as metallic
glass.Again,upon heating metallic glasses
shows a reversible glass-liquid transition at Tg
TECNIQUES OF PREPARATION
• Various rapid cooling tecniques such as
spraying,spinning and laser deposition are
used for the production of metallic glasses.
.
PROPERTIES
• High strenth but lighter in weight.
• They are ductile ,malleable,brittle and opaque.Hardness is
very high.
• The toughness is very high i.e. the fracture resistance is
very high.
• High elasticity.
• High Corrosion resistance.
• They are soft magnetic materials.As a result,easy to
magnetisation and demagnetisation are possible.
• Narrow hytresis loop thus low hytresis energy losses.
• They have high electrical resistivity which leads to a low
eddy current loss.
•

Non-crystalline, amorphous structure

No dislocations
No grain boundaries
•

High elastic limit

•

High strength
Grain boundary
.
[ the amount of magnetic field that a magnet
can produce is known as saturation
magnetisation ] Strong magnets have higher
saturation.
APPLICATION
• Metallic glasses are used as transformer core material in high
powertransformers.
• Due to its high electrical resistivity and nearly zero
temperature coeficient of resistance,these materils are uset in
making cryothermometers,magnetoresistance sensor and
computer memory.
• As the magnetic property of metalic glass are not affected by
irradiation they are used in making container for nuclear
waste disposal.
• These materials are used in preparation of magnets for fusion
reactors and magnets for leviated trains etc.
• Metallic glasses can also be used for making watch cases to
replace Ni and other metals which can cause allergic
reactions.
APPLICATION(Conti…)
• Used in cutting and in surgical instrument.
• Infuture ,it will be used in electronic field can
yield stronger,lighter,and more esaily moulded
castings for personal electronics products.
• They are used in tap recoders as heads ,in the
manufacture of springs and standard
resistances.
.

Metallic glasses

  • 1.
  • 2.
    INTRODUCTION • With theadvent of material science and so many new engineering material are discovered having major application in industries. • This are classified as metals and alloys,cermics,glasses,glass ceramics,composites and semiconductor. • Our presentation is on one of such material which is METALLIC GLASS.
  • 3.
    • The materialwhich has the properties of both metals and glasses is known as metallic glass or metglass. • They have high strength,good magnetic properties and better corrosion resistance.
  • 4.
    METALLIC GLASSES • Itshares the property of both metals and alloys. • Metallic glasses are metal alloy that are amorphous.That is they don’t have long range atomic order. • The major advantages of such glasses are that they are generelly homogeneous in composition,offer strong and superior corrosion resistance.
  • 5.
    BASIC CONCEPT ΔT =1,000,000 C / s
  • 6.
    (Fe,Co, Ni )and(B , Si, S, P ) Nickel - Niobium(Ni-Nb) Magnesium-Zinc (Mg-Zn) Copper-Zirconium (Cu- Zr) Hafnium-Vanadium(Hf-V)
  • 7.
    PREPARATION • To havepeculiar property, metallic glasses are to be made by cooling a molten metal rapidly at rate of 2*1060 c◦/s. • During the proccess of solidification,atoms do not have enough time or enegy to rearrange for crystal nucleation.Thus,li reaching the glass tranition temperature Tg solidifies as metallic glass.Again,upon heating metallic glasses shows a reversible glass-liquid transition at Tg
  • 8.
    TECNIQUES OF PREPARATION •Various rapid cooling tecniques such as spraying,spinning and laser deposition are used for the production of metallic glasses.
  • 9.
  • 14.
    PROPERTIES • High strenthbut lighter in weight. • They are ductile ,malleable,brittle and opaque.Hardness is very high. • The toughness is very high i.e. the fracture resistance is very high. • High elasticity. • High Corrosion resistance. • They are soft magnetic materials.As a result,easy to magnetisation and demagnetisation are possible. • Narrow hytresis loop thus low hytresis energy losses. • They have high electrical resistivity which leads to a low eddy current loss.
  • 15.
    • Non-crystalline, amorphous structure Nodislocations No grain boundaries • High elastic limit • High strength
  • 18.
  • 19.
  • 21.
    [ the amountof magnetic field that a magnet can produce is known as saturation magnetisation ] Strong magnets have higher saturation.
  • 24.
    APPLICATION • Metallic glassesare used as transformer core material in high powertransformers. • Due to its high electrical resistivity and nearly zero temperature coeficient of resistance,these materils are uset in making cryothermometers,magnetoresistance sensor and computer memory. • As the magnetic property of metalic glass are not affected by irradiation they are used in making container for nuclear waste disposal. • These materials are used in preparation of magnets for fusion reactors and magnets for leviated trains etc. • Metallic glasses can also be used for making watch cases to replace Ni and other metals which can cause allergic reactions.
  • 25.
    APPLICATION(Conti…) • Used incutting and in surgical instrument. • Infuture ,it will be used in electronic field can yield stronger,lighter,and more esaily moulded castings for personal electronics products. • They are used in tap recoders as heads ,in the manufacture of springs and standard resistances.
  • 35.