MSE 227: Introduction to Materials Science & Engineering

Course Objective...Introduce fundamental concepts in MSE

You will learn about:• material structure

• how structure dictates properties• how processing can change structure

This course will help you to:• use materials properly• realize new design opportunities

with materials

Time: T/Th: 11:00-12:15 PMRoom: JD3504

Instructor: Dr. R. D. Conner Dept. of Manufacturing System Engineering and Management

Office: JD3511, (818) 677-4730

Office Hour: T, Th: 10-10:45 AM, T, Th: 6:00 – 6:45 PM

Email: rdconner@csun.edu

Website: http://www.csun.edu/~rdconner

Prerequisites: CHEM 101, PHYS220A, PHYS220ALCorequisites: MATH 150B.

Textbook: Fundamentals of Materials Science and Engineering, 3nd Ed. 2008.

D. Callister, Jr. J. Wiley & Sons, NY

Course Description: An introductory course in engineering materials including metals, ceramics, polymers, and composites. Study of atomic and crystalline structures of materials. Application of basic principles to the study of mechanical, physical, and chemical behavior of materials. Selection of materials in engineering applications based on materials properties and processing. Design project on materials properties, selection or application.

The learning objectives are: To understand the principles of engineering and science in applications of materials and design. To learn to find information in literature and other available sources. To learn to use information systems (computer, internet, and other available sources) in engineering practice.

Methods of Students evaluation:

• Grading Policy

• Homework 10.0 %

• Mid-term Exams 30 %

• Term paper 15 %

• Design Project 15%

• Final Exam 30%

No Make Up Exams

• Homework: Homework problems will be passed out in class. Each student will turn in homework one week after it is assigned. On the day homework is due, students will be randomly selected to solve selected homework problems at the board, explaining to the class how each problem is worked. Students are encouraged to work together on homework. Students will be evaluated on both the quality of their written answers and board presentations.

• Exams: Exams will be based on homework and information provided in lecture and assigned reading. All exams will be closed book. The final will be cumulative. Relevant formulas, tables, etc. will be provided.

• Term Paper: Each student will write a 4-page term paper on a topic of interest in materials. Term papers are due on October 26, 2010.

• Design Presentation: The class will be divided evenly into groups for a materials selection design project. Projects for each group will be assigned by the instructor. Each group will write a report on their respective project, as well as make an oral presentation to the class.

Grades will be based on the weighted average of the total number of points accumulated by the student during the semester. Letter grades will be assigned as follows:

 

100 - 90 A

90 – 87.5 A-

87.5 – 82.5 B+

82.5 – 77.5 B

77.5 – 72.5 B-

72.5 – 67.5 C+

67.6 – 62.5 C

62.5 – 60 C-

<60 D

<50 F

Suggestions for success in this class:• 1. Read the relevant material in the book (preferably

before the lecture topic)• 2. Review and understand the examples given in the

book.• 3. Do the assigned homework. If you are having

difficulty with a particular concept, work additional problems given in the book on that topic that have the answers given in the back of the book.

• 4. Come to office hours.• 5. Seek help: student services, tutors, etc.

Academic success is directly proportional to the amount of time devoted to study.

Criteria Points

Identified problem type 0 1 2

Identified relevant criteria: variables given and to be solved for

0 1 2

Used appropriate equations/solution method

0 1 2

Followed logical sequence to solution 0 1 2

Proper arithmetic and units 0 1 2

Total:

The Materials Science Mantra:

The properties of a material depend upon its composition and microstructure

The microstructure of a material depends upon its composition and the processing that it undergoes

Materials are... engineered structures...not blackboxes!

Structure...has many dimensions...

Structural feature Dimension (m)

atomic bonding

missing/extra atoms

crystals (ordered atoms)

second phase particles

crystal texturing

< 10-10

10-10

10-8-10-1

10-8-10-4

> 10-6

1

Chapter 1

ex: hardness vs structure of steel • Properties depend on structure

ex: structure vs cooling rate of steel • Processing can change structure

2

Structure, Processing, & Properties

Cooling Rate (C/s)

100

200

300

400

500

600

0.01 0.1 1 10 100 1000

(a)

30m

(b)

30m

(d)

30m(c)

4m

Hard

ness

(B

HN

)

1. Pick Application Determine required Properties

2. Properties Identify candidate Material(s)

3. Material Identify required Processing

Processing: changes structure and overall shapeex: casting, sintering, vapor deposition, doping forming, joining, annealing.

Properties: mechanical, electrical, thermal,magnetic, optical, deteriorative.

Material: structure, composition.

3

The Materials Selection Process

T (°C)-200 -100 0

Cu + 3.32 at%Ni

Cu + 2.16 at%Ni

deformed Cu + 1.12 at%Ni

1

2

3

4

5

6

Resi

stiv

ity,

(1

0-8 O

hm

-m)

0

Cu + 1.12 at%Ni

“Pure” Cu

• Electrical Resistivity of Copper:

• Adding “impurity” atoms to Cu increases resistivity.• Deforming Cu increases resistivity.

4

ELECTRICAL

• Space Shuttle Tiles: --Silica fiber insulation offers low heat conduction.

• Thermal Conductivity of Copper: --It decreases when you add zinc!

Composition (wt%Zinc)Therm

al C

onduct

ivit

y

(W/m

-K)

400

300

200

100

00 10 20 30 40

5100m

THERMAL

• Magnetic Permeability vs. Composition: --Adding 3 atomic % Si makes Fe a better recording medium!

Magnetic FieldMagneti

zati

on

Fe+3%Si

Fe

6

• Magnetic Storage: --Recording medium is magnetized by recording head.

MAGNETIC

• Transmittance: --Aluminum oxide may be transparent, translucent, or opaque depending on the material structure.

7

single crystalpolycrystal:low porosity

polycrystal:high porosity

OPTICAL

• Stress & Saltwater... --causes cracks!

• Heat treatment: slows crack speed in salt water!

4m--material: 7150-T651 Al "alloy" (Zn,Cu,Mg,Zr)

8

“held at 160C for 1hr before testing”

increasing loadcrack

sp

eed

(m

/s)

“as-is”

10-10

10-8

Alloy 7178 tested in saturated aqueous NaCl solution at 23C

DETERIORATIVE