Material engineers are experts on the materials which are used in the productions of goods. They know the specifics of raw materials and how they will perform when used in manufacturing. They use their knowledge of materials to either make the process of manufacturing cheaper or improve the quality of a product. They work with other engineers as well to see what requirements need to be filled and which material or process can be utilized. Material engineers work with other engineers in the manufacturing of goods, and have to communicate which material would be better suited to the requirements. They usually work closely in several areas of production and often find solutions to problems in the manufacturing process by focusing on the materials best suited for the application.
Material engineers may be asked which material should serve as a proposed upper receiver in a new Ar-15 prototype. Taking their knowledge of materials the engineer will consider the stresses involved with that certain piece, and decide it should be milled from billet aluminum. However machining is slow and expensive, and billet aluminum is not the cheapest. The engineer would then have to communicate to the people spending the money on the machines and the material why those materials and processes are necessary.
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The engineer will use figures and facts to convince the manufacturers of how they should proceed. In this case the form is very much deliberative because it is focused on setting future policy based on what is advantageous. The use of deliberative oratory is clear because the engineer is trying to persuade or dissuade the manufacturer.
While I don't have much experience in the field myself I have several friends who occupy themselves with this profession because I already have an interest in all of this. I have been thinking about entering the field myself (so this was an informative post for me as well) I interviewed them on about what they do, and I looked up some of the responsibilities material engineers have.
It sounds like the engineer could benefit from being comfortable using various figures of speech in order to persuade the client that he has chosen the best material for the job. If I was the client, I would also appreciate it if the engineer communicated very clearly so that I could understand his thought process.
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