Like water, metals exist in phases. When metal is heated or cooled, the metal goes through a phase change. Depending on what phase the metal is in, it behaves and looks differently. For example, steel can exist as austenite, bainite, pearlite, and martensite. Martensite is formed when austenite is rapidly cooled from austenite. Although martensite is hard, it is brittle. Therefore, materials science engineers can temper, or heat treat martensite to be stronger and more applicable in infrastructure. Students will model the tempering process using chocolate.
Ooey Gooey Phases TEK8 Student Handout
The student handout will be given to all students working on the design challenge. It gives a brief recap of the story, it helps the students identify what they are attempting to achieve, and it recaps the design process.
Ooey Gooey Phases Facilitator’s Guide
This Instructor’s Guide provides the instructor additional information on how to run the design challenge with alternatives for materials and test setups as well as information to help make the design challenge a good educational experience.
The Telling the Story Video conveys the societal impact of the student’s research that is the basis for the design challenge and will set the problem-solving context for students.
leads students through the design process. It indicates materials available, states what the criteria are for success and any constraints. It also gives a second ‘level’ of the design challenge that allows ‘early completers’ to move on to a slightly more difficult challenge.