Week 6 (week of February 19) - Precipitation HT of 2024 aluminum
Next week (week of February 26), Quiz 1 will be administered during labs. Quiz topics: calibration and measurment standards, standardized tests, tensile test, copper coldworking/annealing. There will be 7 questions selected from: POTENTIAL QUIZ QUESTIONS FOR ALL QUIZZES THIS SEMESTER

EGR070:
Background information on precipitation heat treating and agining of 2024 aluminum alloy

EGR270:
Heat treat 2024 aluminum alloy lab (lots of hardness data - be sure to get your turn at measuring hardness!)
Procedures

Assignment: technical letter discussing this week's lab
CLICK HERE for details (handed out in LEC on Monday). Don't forget to include the rubrics/checklists:
Technical memo/letter grading rubric
Checklist/grade sheet for EGR270 graphs

Reference information:
Reference information might include: aluminum-copper alloy phase diagram ; ASM Handbooks, on-line


Aging characteristics of alloy 2024 sheet (ASM Handbook, Volume 4). Note, hardness and tensile strength are directly related (but are not the same thing). The data was recorded at ROOM TEMPERATURE - after exposure to various temperatures/times; therefore, the changes in strength are due to changes in the microstructure (such as aging and overaging).

Rockwell B scale hardness data from long duration aging (for a material with hardness of 56 on the Rockwell B scale it is written as 56 HRB).