This document discusses heat treatment processes for strengthening non-ferrous alloys. It explains that precipitation hardening relies on maintaining a supersaturated solid solution and forming precipitates through precise heat treating steps like solutionizing, quenching, and aging. The hardness increases with aging time until reaching a maximum, and can lead to overaging if held at elevated temperatures for too long. When properly applied, heat treatment allows altering various material properties to suit different applications such as home industries and medical devices.

1. H E A T T R E A T M E N T
I N N O N - F E R R O U S
A L L O Y S
A S E M E S T E R 4 M E C H A N I C A L
M E T A L L U R G Y P R E S E N T A T I O N B Y
Savio Fernandes .
D O N B O S C O
I N S T I T U T E O F
T E C H N O L O G Y
Subject :
Material
Technology

2. I N T R O D U C T I O N
W H A T M A K E S N O N - F E R R O U S A L L O Y S S I G N I F I C A N T
Physical Properties such as An advantage over ferrous alloy is
no presence of iron , thus giving
resistance to rust and corrosion,
making them ideal for roofing and
outdoor signs.
Corrosion
resistance
Conductivity Machinability
Non magnetic, therefore has its use
in wiring and conductive appliances.

3. W H I C H A R E N O N F E R R O U S
A L U M I N I U M
C O P P E R
Z I N C
T I N
Refractory metals including
Tungsten (W)
Molybdenum (Mo)
Tantalum(Ta)

4. D I S P E R S I O N
H A R D E N I N G
P R O C E S S L I K E C O L D W O R K I N G A R E I N E F F E C T I V E A T
H I G H T E M P E R A T U R E .
Possible for Alloys possessing high thermal conductivity eg copper
Borides, carbides acts as particle reinforcer when copper is heated and made
thermally stable.
copper offers low elastic modulus resulting in less thermal stresses for an air cooled
structure.

5. Relies on changes in solid solubility
with temperature to produce fine
particle in an impurity phase.
N A M E L Y A G E H A R D E N I N G A I M S
A T I N C R E A S I N G T H E Y I E L D
S T R E N G T H I N A L L O Y S I N C L U D I N G
A L U M I N I U M ,
M A G N E S I U M A N D
S O M E S T E E L S
P R E C I P I T A T I O N
H A R D E N I N G
Unlike tempering , material has to be
kept at elevated temperature
Material under several hours of
process generates better hardening
results.

6. B A S I C S T E P S
B E L O W A R E S E V E R A L S T E P S T A K E N B E F O R E
A C H I E V I N G H A R D N E S S
S O L U T I O N I Z I N G
Primary objective is to
obtain a
supersaturated solid
solution
8 3 0 - 1 0 6 5 D E G R E E
C E L S I U S
C O O L I N G
Maintains
supersaturation
Q U E N C H I N G O R
A I R - C O O L I N G P R E C I P I T A T I O N
Causes precipitates to
form.
4 8 0 - 6 2 0 D E G R E E
C E L S I U S

7. O V E R A G I N G
Logarithmic scale for aging
Hardness
O
veraging
W I T H P R O G R E S S I N T I M E , H A R D N E S S I N C R E A S E S , A T T A I N S
A M A X I M U M A N D D I S S I P A T E S
T H E T I M E D E L A Y C A U S E D I S O V E R A G I N G .

8. D R A W B A C K S
C
R
A
C
K
I
N
G
C O N T R O L L E D
T E M P E R A T U R E
N O D I S T O R T
M A C H I N A B I L I T Y
I
O
N

9. A P P L I C A T I O N S
H O M E I N D U S T R Y M R I S C A N N E R S

10. S U M M A R Y
The objective of precipitation
strengthening is to obtain
grater yield strength,
dependent on solid solubility
and temperature .
Excessive hours of heat
treating leads to overaging
Heat treatment hence alters
physical properties;
machinability, ductility,
hardness, electrical and
magnetism in materials

11. T H A N K Y O U !
D O N B O S C O
I N S T I T U T E O F
T E C H N O L O G Y
Subject :
Material
Technology