Palestine Polytechnic University Department of Mechanical Engineering ME251: Materials Science. Lecturer: Dr. Maher Al-Jabari. Course Objective: Introduce fundamental concepts in Materials Science
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Lecturer: Dr. Maher Al-Jabari
Introduce fundamental concepts in Materials Science
You will learn about:
• material structure
• how structure dictates properties
• how processing can change structure
This course will help you to:
• use materials properly – material selection
• realize new design opportunities with materials
Short Exam-110 %
Midterm Exam30 %
Short Exam-210 %
Quizzes and Attendance10 %
Final Exam40 %
Students are required to attend all classes
Unexcused absence of exams is not accepted
Make-up exams are expected to be harder.
Structure / Levels:
Subatomic (e.g. electron, protons)
Atomic (atoms and molecules)
Microscopic (grains: large groups)
macroscopic (by eye)
Response to a specified imposed stimulus
Kind and magnitude
Example Heat Treatment
Cup and Liner
• Properties depend on structure
ex: hardness vs structure of steel
Just Keep in Mind
to the end !
Cooling Rate (ºC/s)
• Processing can change structure
ex: structure vs cooling rate of steel
Determine required Properties
Properties: mechanical, electrical, thermal,
magnetic, optical, deteriorative.
Identify candidate Material(s)
Material: structure, composition.
Identify required Processing
Processing: changes structure and overall shape
ex: casting, vapor deposition, forming, joining,
Composition (wt% Zinc)
• Space Shuttle Tiles:
- Silica fiber insulation
offers lowheat conduction.
• Thermal Conductivity
-It decreases when you add zinc!
Cu + 3.32 at%Ni
Cu + 2.16 at%Ni
deformed Cu + 1.12 at%Ni
Cu + 1.12 at%Ni
• Electrical Resistivity of Copper:
Adapted from Fig. 18.8, Callister 7e.
(Fig. 18.8 adapted from: J.O. Linde,
Ann Physik5, 219 (1932); and
C.A. Wert and R.M. Thomson,
Physics of Solids, 2nd edition,
McGraw-Hill Company, New York,
• Adding “impurity” atoms to Cu increases resistivity.
• Deforming Cu increases resistivity.
Fe+ 3% Si
• Magnetic Storage:
is magnetized by
• Magnetic Permeability
--Adding 3 atomic % Si
makes Fe a better
--Aluminum oxide may be transparent, translucent, or
opaque depending on the material structure.
• Use the right material for the job.
• Understand the relation between properties,
structure, and processing.