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These are the Lecture Slides of Material Science for Engineers which includes Structure of Wood, Moisture Content, Density of Wood, Mechanical Properties of Wood, Expansion and Contraction of Wood, Concrete Materials, Properties of Concrete etc. Key important points are: Materials for Engineering, Materials Science, Organization of Atoms, Electrons and Nuclei, Structure of Steel, Materials Selection Process, Crystal Structure, Electrical Resistivity of Copper
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Progress in atomic-level understanding
DNA ~2 nm wide
THE SCALE OF THINGS
(^10) nm
Cell membrane
ATP synthase
Schematic, central core
Cat ~ 0.3 m
Dust mite^300
μ
m
Monarch butterfly
~ 0.1 m
MEMS (MicroElectroMechanical Systems) Devices
10 -
μm wide^ Red blood cellsPollen grain
Fly ash ~ 10-
μm
Bee ~ 15 mm
Atoms of silicon spacing ~tenths of nm
Head of a pin
1-2 mm
Magnetic domains garnet
film 11
μm widestripes
Progress in miniaturization
Indium arsenidequantum dot
Quantum dot array -- germanium dots on silicon Microelectronics Objects fashioned from
metals, ceramics, glasses, polymers ...
Human hair ~ 50
μm wide
The
Microworld
0.01 1 nanometer (nm) 0.1 nm
μ m 0.1 10 nm
μ m 1 micrometer (100 nm
μ m)
0.01 mm 10
μ m 0.1 mm 100
μ m 1 meter (m)0.1 m100 mm0.01 m1 cm10 mm 1 millimeter (mm)
10
0 m 10
-1^ m 10
-2^ m 10
-3^ m 10
-4^ m 10
-5^ m 10
-6^ m 10
-7^ m 10
-8^ m 10
-9^ m 10
-^
m
Visiblespectrum
The
Nanoworld
Red blood cellswith white cell
~ 2-
μ
m
ex: hardness vs structure of steel
Callister 6e.
Callister 6e.
ex: structure vs cooling rate of steel
Structure, Processing, & Properties• Processing can change structure
Cooling Rate (C/s)
600500400300200100
1
10
100
1000
Callister 6e.
(Fig. 18.8 adapted from: J.O. Linde,Ann Physik 5, 219 (1932); andC.A. Wert and R.M. Thomson,Physics of Solids, 2nd edition,McGraw-Hill Company, New York,1970.)
The Principles of
Engineering Materials, Fig. 1-7(a), p. 9,1973. Electronically reproducedby permission of Pearson Education, Inc.,Upper Saddle River, New Jersey.
Callister 6e.
MRS Bulletin,
7150-T651 Al "alloy"(Zn,Cu,Mg,Zr)
Callister 6e.
Marine Corrosion, Causes,
and Prevention, John Wiley and Sons, Inc.,1975.)
Adapted from Fig. 11.24,Callister 6e. (Fig. 11.24 provided courtesy of G.H.Narayanan and A.G. Miller, Boeing CommercialAirplane Company.)
“held at160C for 1hrbefore testing”
increasing load
crack speed (m/s)
“as-is”
10 -8 10 -
Alloy 7178 tested insaturated aqueous NaClsolution at 23C