MSE : 재료과학과 공학
교과 목표...
재료과학에 대한 기본적인 개념 소개
학습 내용:
• material structure
• how structure dictates properties
• how processing can change structure
학습 배경:
• use materials properly
• realize new design opportunities
with materials
Chapter 1 - 1
강의
Lecturer: 최병상교수
Time: 월 1~2교시, 수 1교시
Location: 2131 강당
Activities:
• Present new material
• Announce reading and homework
• Take quizzes, mid and final terms*
*Make-ups given only for emergencies.
*Discuss potential conflicts beforehand.
Chapter 1 - 2
LABORATORY SECTIONS
Instructor:
Location:
Purpose: To learn more about materials by relating
lecture material with observations. Also to learn to properly
formulate and write engineering reports and proposals.
Chapter 1 - 3
TEACHING ASSISTANTS
Name
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Office
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Tel.
X-XXXX
X-XXXX
X-XXXX
X-XXXX
X-XXXX
E-mail
_____
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Teaching Assistants will
• participate in recitation sessions,
• have office hours to help you with course material
and problem sets.
Chapter 1 - 4
OFFICE HOURS
X:XX-X:XX each weekday**
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_____ XXX
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**Contact professors for special arrangements
Activities:
• Discuss homework, quizzes, exams
• Discuss lectures, book
• Pick up missed handouts
Chapter 1 - 5
COURSE MATERIALS (with text)
Required text:
• 재료과학과 공학, 박인규, 이재갑, 김용석, 김형준 옮김, W.D.
Callister, Jr. and D.G. Rethwisch 공저, 제9판, 시그마프레스(2015년)
Materials Science and Engineering: An Introduction, W.D. Callister,
Jr. and D.G. Rethwisch, 9th edition, John Wiley and Sons, Inc.
(2015).
Optional Material:
• _____
________.
• _____
________.
• _____
________.
Chapter 1 - 6
COURSE MATERIALS
(with WileyPLUS)
Required text:
• WileyPLUS for Materials Science and Engineering: An Introduction,
W.D. Callister, Jr. and D.G. Rethwisch, 9th edition, John Wiley
and Sons, Inc. (2015).
Website: http://www.wileyplus.com/xxxxxxxxxxx
• Can be bought online at wileyplus.com for 40% of textbook price
• Includes complete online version of textbook
• Or comes bundled with textbook at bookstore
• $5 more than textbook alone
• Homework assignments with instant feedback and hints
• Computer graded self-help problems
• Hotlinks in homework to supporting text section
• Quizzes
Chapter 1 - 7
WEBSITES
Course Website: 사이버 강좌
• Syllabus
• Lecture notes
• Answer keys
• Grades
Text Website: http://www.wiley.com/college/callister
• VMSE for 3D visualization and manipulation of atomic structures
• Mechanical Engineering and Biomaterials online support modules
• Case studies of materials usage
• Extended learning objectives
• Self-assessment exercises
Chapter 1 - 8
Virtual Materials Science &
Engineering (VMSE)
Website: http://www.wileyplus.com/college/callister
Student Companion Site
• Users can manipulate molecules and crystals to
better visualize atomic structures
• Unit cells such as BCC, FCC, HCP
• Crystallographic planes, directions, and defects
• Polymer repeat units and molecules
• Diffusion computations
Chapter 1 - 9
성적
Weekly in-lecture quizzes
XX%
Held on _____ at the beginning of class
Based on core homework problems
Your lowest quiz grade will be dropped
Midterm #1
XX%
Tentatively scheduled for:
Material covered:
Midterm #2
XX%
Tentatively scheduled for:
Material covered:
Final
XX%
Tentatively scheduled for:
Material covered:
Chapter 1 - 10
READING SCHEDULE
Week
1
2
3
4
5
6
7
8
9
10
Topic
General Intro; Atomic Bonding
Crystalline Structures; Imperfections
Diffusion; Mechanical Properties
Strengthening Mechanisms; Failure
Phase Diagrams
Phase Transformations
Applications & Processing of Metal Alloys
Chapter
1,2
3,4
5,6
7,8
9
10
11
12
Lectures: will highlight important portions of each chapter.
Chapter 1 - 11
Chapter 1 - Introduction
• 재료과학이란?
• 왜 우리는 재료과학을 공부하는가?
• Materials drive our society
–
–
–
–
Stone Age
Bronze Age
Iron Age
Now?
• Silicon Age?
• Polymer Age?
Chapter 1 - 12
Example – Hip Implant
• 나이가 들거나 혹은 어떤 질병으로 인하여 관절이
퇴화된다. Particularly those with large loads (such
as hip).
Adapted from Fig. 22.25, Callister 7e.
Chapter 1 - 13
Example – Hip Implant
• 요구사항
– 기계적 강도
(many cycles)
– 훌륭한 윤활작용
– 생체 적합성
Adapted from Fig. 22.24, Callister 7e.
Chapter 1 - 14
Example – Hip Implant
Adapted from Fig. 22.26, Callister 7e.
Chapter 1 - 15
Hip Implant
• Key problems to overcome
– fixation agent to hold
acetabular cup
– cup lubrication material
– femoral stem – fixing agent
(“glue”)
– must avoid any debris in cup
Ball
Acetabular
Cup and Liner
Femoral
Stem
Adapted from chapter-opening photograph,
Chapter 22, Callister 7e.
Chapter 1 - 16
Example – Develop New Types of
Polymers
• Commodity plastics – large volume ca. $0.50 / lb
Ex.
Polyethylene
Polypropylene
Polystyrene
etc.
•
Engineering Resins – small volume > $1.00 / lb
Ex.
Polycarbonate
Nylon
Polysulfone
etc.
Can polypropylene be “upgraded” to properties (and price) near
those of engineering resins?
Chapter 1 - 17
재료과학과 공학
• 재료과학
– 재료의 구조와 성질 간의 상관관계 연구
– 새로운 재료를 개발 또는 합성
• 재료공학
– 상관관계를 이용하여 원하는 성질을 얻을 수 있는 재료의
구조를 설계하고 제조
– 기존에 사용되던 재료를 사용하는 새로운 제품이나 시스템을
만들거나 재료를 제조하는 공법을 개발
Chapter 1 - 18
구조, 성질, 공정 및 성능
• 구조(structure)
– 내부 구성요소의 배치
– 미시적(microscopic)
– 거시적(macroscopic)
• 성질(property)
– 기계적(mechanical): 가해진 힘에 대한 변형 반응, 탄성계수와 강도
– 전기적(electrical): 전가장의 외부 자극에 대한 재료의 반응, 전기 전도도와
유전상수
– 열적(thermal): 열용량과 열전도도
– 자기적(magnetic): 자기장에 대한 재료의 반응
– 광학적(optical): 잔자기파나 빛의 방사 자극에 대한 반응, 굴절률, 반사도 등
– 열화적(deteriorative) : 재료의 화학 반응성
• 공정(processing)
• 성능(performance)
Chapter 1 - 19
구조, 공정, 그리고 특성
• 재료의 구조에 따라 재료의 특성이 결정
ex: hardness vs structure of steel
(d)
Hardness (BHN)
600
500
400
(c)
(a)
(b)
4 mm
300
200
30 mm
30 mm
100
0.01 0.1
30 mm
Data obtained from Figs. 10.30(a)
and 10.32 with 4 wt% C composition,
and from Fig. 11.14 and associated
discussion, Callister & Rethwisch 8e.
Micrographs adapted from (a) Fig.
10.19; (b) Fig. 9.30;(c) Fig. 10.33;
and (d) Fig. 10.21, Callister &
Rethwisch 8e.
1
10 100 1000
Cooling Rate (ºC/s)
• 공정에 따라 재료의 특성이 바뀔 수 있다.
ex: structure vs cooling rate of steel
Chapter 1 - 20
재료의 종류
• Metals:
– Strong, ductile
– High thermal & electrical conductivity
– Opaque, reflective.
• Polymers/plastics: Covalent bonding  sharing of e’s
– Soft, ductile, low strength, low density
– Thermal & electrical insulators
– Optically translucent or transparent.
• Ceramics: ionic bonding (refractory) – compounds of metallic
& non-metallic elements (oxides, carbides, nitrides, sulfides)
– Brittle, glassy, elastic
– Non-conducting (insulators)
Chapter 1 - 21
재료 선정 절차
1. Pick Application
Determine required Properties
Properties: mechanical, electrical, thermal,
magnetic, optical, deteriorative.
2. Properties
Identify candidate Material(s)
Material: structure, composition.
3. Material
Identify required Processing
Processing: changes structure and overall shape
ex: casting, sintering, vapor deposition, doping
forming, joining, annealing.
Chapter 1 - 22
전기적 특성
• 동의 전기 저항:
6
Adapted from Fig. 18.8, Callister &
Rethwisch 8e. (Fig. 18.8 adapted
from: J.O. Linde, Ann Physik 5, 219
(1932); and C.A. Wert and R.M.
Thomson, Physics of Solids, 2nd
edition, McGraw-Hill Company, New
York, 1970.)
(10-8 Ohm-m)
Resistivity, r
5
4
3
2
1
0
-200
-100
0
T (ºC)
• Adding “impurity” atoms to Cu increases resistivity.
• Deforming Cu increases resistivity.
Chapter 1 - 23
열특성
-- Silica fiber insulation
offers low heat conduction.
Adapted from chapteropening photograph,
Chapter 17, Callister &
Rethwisch 3e. (Courtesy
of Lockheed
Missiles and Space
Company, Inc.)
100 mm
• Thermal Conductivity
of Copper:
-- It decreases when
you add zinc!
Thermal Conductivity
(W/m-K)
• Space Shuttle Tiles:
Adapted from
Fig. 19.4W, Callister
6e. (Courtesy of
Lockheed Aerospace
Ceramics Systems,
Sunnyvale, CA)
(Note: "W" denotes fig.
is on CD-ROM.)
400
300
200
100
0
0
10
20 30 40
Composition (wt% Zinc)
Adapted from Fig. 19.4, Callister & Rethwisch
8e. (Fig. 19.4 is adapted from Metals Handbook:
Properties and Selection: Nonferrous alloys and
Pure Metals, Vol. 2, 9th ed., H. Baker,
(Managing Editor), American Society for Metals,
1979, p. 315.)
Chapter 1 - 24
자성특성
• Magnetic Storage:
vs. Composition:
-- Adding 3 atomic % Si
makes Fe a better
recording medium!
Magnetization
-- Recording medium
is magnetized by
recording head.
• Magnetic Permeability
Fe+3%Si
Fe
Magnetic Field
Fig. 20.23, Callister & Rethwisch 8e.
Adapted from C.R. Barrett, W.D. Nix, and
A.S. Tetelman, The Principles of
Engineering Materials, Fig. 1-7(a), p. 9,
1973. Electronically reproduced
by permission of Pearson Education, Inc.,
Upper Saddle River, New Jersey.
Chapter 1 - 25
광 특성
• 투과성:
-- Aluminum oxide는 재료의 구조에 따라 transparent, translucent,
혹은 opaque 할 수 있다.
single crystal
polycrystal:
low porosity
polycrystal:
high porosity
Adapted from Fig. 1.2,
Callister & Rethwisch 8e.
(Specimen preparation,
P.A. Lessing; photo by S.
Tanner.)
Chapter 1 - 26
퇴화(DETERIORATIVE)
• Stress & Saltwater...
crack speed in salt water!
crack speed (m/s)
-- causes cracks!
• Heat treatment: slows
10-8
10-10
Adapted from chapter-opening photograph,
Chapter 16, Callister & Rethwisch 3e.
(from Marine Corrosion, Causes, and
Prevention, John Wiley and Sons, Inc., 1975.)
“as-is”
“held at
160ºC for 1 hr
before testing”
Alloy 7178 tested in
saturated aqueous NaCl
solution at 23ºC
increasing load
Adapted from Fig. 11.20(b), R.W. Hertzberg, "Deformation and
Fracture Mechanics of Engineering Materials" (4th ed.), p. 505, John
Wiley and Sons, 1996. (Original source: Markus O. Speidel, Brown
Boveri Co.)
-- material:
4 mm
7150-T651 Al "alloy"
(Zn,Cu,Mg,Zr)
Adapted from Fig. 11.26,
Callister & Rethwisch 8e. (Provided courtesy of G.H.
Narayanan and A.G. Miller, Boeing Commercial Airplane
Chapter 1 - 27
Company.)
요약
Course Goals:
• Use the right material for the job.
• Understand the relation between properties,
structure, and processing.
• Recognize new design opportunities offered
by materials selection.
Chapter 1 - 28