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Emergency Exits Please make yourself aware of the location of the emergency exits in this room. Food and Drink If you do bring food and drink into the room, please take empty cups, and paper etc. away with you. Fall 12
CHE 333 Materials Engineering Richard Brown Website for all notes and information:-
Objectives Objective: Introduce the area of materials science and engineering so that rational decisions involving materials in specific applications can be made.
OUTCOMES Students of this class will achieve the following outcomes: 1. An ability to design and conduct experiments as well as the analyze data. 2. Ability to communicate effectively.
Outline Introduction, Types of Materials, Atomic Bonding, Crystal Structures. Solidification, Crystalline Defects. Phase Diagrams. Phase Transformations and Heat Treatments. Diffusion in the Solid State. Mechanical Properties of Metals. Strengthening Mechanisms and Failure. Mechanical Properties of Metals. Polymers Ceramic Materials Composite Materials Review Sessions.
Exams, etc Exams: One hour exams will be given during class on Oct 3, Nov 5 and Nov 30 th with one take home at the end of the semester, distributed on Dec 3 rd and due Dec 10th. Please see Dr. Brown to accommodate requests regarding extra time and different locations. NO ELECTRONIC DEVICES DURING EXAMS, INCLUDING PHONES, IPODS, CALCULATORS. An example of the type of exam in this course will be shown in class. Grading Basis: Each of the four exams will count 10% of the final grade. Homework will count for 20%. Laboratory reports will count for 30% of the final grade. Presentations of the laboratory will count for 10%. If a student cannot make an exam, make sure to call before with a legitimate reason for the absence. No attendance at an exam with no legitimate excuse will count for a ZERO If a student needs special provision please contact me. Office Hours: Dr. Brown has office hours 1-2 p.m. on Wednesdays in Crawford rm 110. Teaching assistants will also be available..
EXAM 1. Does the “hardenability” of a steel change with alloy composition? and is it different from hardness?. What does “tempering” do to a quenched steel that is 100% martensite. Does it increase hardness, decrease hardness or no change? 2What is an edge dislocation and what is a screw dislocation. Show how a Burgers circuit is constructed and compare vectors for an edge and screw dislocation. 3How does carbon diffuse through iron? If a steel was decarburizing, how would you solve to find the time to reduce the carbon level to half the steel level and a depth of 0.5mm? 4Draw an engineering stress strain curve, and compare it with a true stress strain for the same materials. Which curve would you use to explain work hardening and what is work hardening. Show how the 0.2% yield stress can be calculated.
HOMEWORKS Homework assignments will be provided in class to be submitted on the following Monday class. The address will be the “URI” address used by the registrars office on the official class roster.
“No Class” days October 8, no classes. November 7th th, No classes as Tuesday classes on Wednesday. Dec 10 th is last class in this course.
Labs Laboratory: Safety Class Wed Sept 12. Laboratories will start on Wednesday, September 12, at 2:00 p.m. in room 121 Crawford Hall. Two powerpoint presentations and two laboratory reports are mandatory (40% of grade). All students must be registered in a lab section.
Book There is no book required: Notes will be on the web page, as will homeworks. 33/index.htm Materials Science and Engineering; An Introduction by William D. Callister William F. Smith, Materials Engineering Use the library.
Illness Policy Illness Due to Flu The H1N1 Flu Pandemic may impact classes this semester. If any of us develop flu- like symptoms, we are being advised to stay home until the fever has subsided for 24 hours. So, if you exhibit such symptoms, please do not come to class. Notify me at or of your status, and we will communicate through the medium we have established for the class. We will work together to ensure that course instruction and work is completed for the semester. The Centers for Disease Control and Prevention have posted simple methods to avoid transmission of illness. These include: covering your mouth and nose with a tissue when coughing or sneezing; frequently washing your hands to protect from germs; avoiding touching your eyes, nose and mouth; and staying home when you are sick. For more information, please view URI information on the H1N1 will be posted on the URI website at with links to the
Materials Engineering How to employ natural and other materials for use by humans. Development of new materials. Understanding performance of materials. Improving performance of new and existing materials.
Examples Ipods – external case – structural, color, electronic components – mixtures of elements, polymers for line widths. Medical devices, replacement joints – hips – mixture of metals polymers and ceramics. Environmental – processes, electroplating. Construction – new steels, coatings, carbon fiber reinforcement.
Examples Light weight cars – aluminum, new alloys Audi, Chrysler. Fuel cells – replacement for platinum catalyst, polymer membrane efficiency. Corrosion – Alaska pipeline. Antifouling – new coatings.
Properties. Materials properties controlled by 1) composition – the elements 2) thermo mechanical history – heat and mechanical deformation processes 3) structure – the phases present and their distribution. These are all related. The composition controls the structure somewhat as does the history. Optimize materials to obtain final properties. Eg strength, cost, appearance, conductivity, corrosion resistance, weight.
Ferrari 2001 M. Schumacher 14 races won out of 16
Materials Useage Carbon fiber used in most of the bodywork, even for suspension components. Titanium connecting rods are used with fractured surfaces for bearings onto crankshaft for better alignment. Strength to weight important along with stiffness. Bearings also important. Only three or four of these cars built. 10 BILLION bearings made per year. Cost/performance very different.
Technology Development Sword in Xi’an in China at the Terracota Army Site. Today chrome plating and chromates are environmental issues and their replacement is sought.