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Materials selection

Processing selection

1. Application determine required Properties

2. Properties determine candidate Material(s)

3. Material determine required Processing

Processing: to change microstructure and overall shapeex: casting, sintering, vapor deposition, doping

forming, joining, annealing

Properties: mechanical, electrical, thermal,magnetic, optical

Material: microstructure, composition

The Materials Selection Process

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Properties are a link between the fundamental issues of materials science and the practical challenges of

materials engineering

From structure to properties

Comparison of crystal structures for (a) aluminium (face-centered-cubic) and (b) magnesium (hexagonal close-packed).

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From structure to properties

What material do I select for a particular application?

1. The general type of material is appropriate.

2. The best specific material within the category must be found.

Gas pressure can be 14 MPa for indefinite periods

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Ashiby charts - pairs of materials properties are ploted against each other

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Bar-chart – showing thermal conductivity for families of solid

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Material selection is determined by function. Shape sometimes influences the selection.

What does component do?

Materials and their attributes

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En example

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Processing selection depends on material and shape

The classes of process.

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Heat treatment and tensile strength of tool steels

Heat treatment and elongation of tool steels

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Applied Engineering Materials - MT 7151 - HT06

Materials selection – selecting the right materials for a given engineering design or a given application

The report should contain the following sections:1. Abstract (< 150 words)2. Title of the report, author’s name(s), full contact details includingemail address3. Introduction4. Material selection5. Processing selection……6. Discussions7. Conclusions8. Acknowledgements9. References

The investigation should address the following points:

1. Background2. Function of the component or part

What non-negotiable conditions must be met?What negotiable, but desirable conditions…What is to be minimized or maximized?What parameters of the problem is the designer free to change

3. Service conditions4. The required properties for the component,5. The required shape of the component6. Material selection

Candidate MaterialsComposition (function for each element in the material)Crystalline structureMicrostructure and properties of the materialMethods to study the microstructure and mechanical properties

7. Processing selectionShaping, joining and finishing etc.Processing and properties of the material, e.g. heat treatment, material strengthening etc.

8. Cost and environment

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Material selection for a kitchen knife

By Adrian RembowskiMagnus Andersson

Turning Tools Made of High Speed Metal

By: Krister PerssonJohan Silow

By: Hanna Larsson Martina ArvidssonBy: Johan Pelinder

By: Tobias SöderlindDennis Thornsäter

By: Firas Matook Andreas Nilsson

Last year projects

By: Firas Matook Andreas Nilsson

Suggested applications

1. seat frame in cars

2. Automotive transmission casing

3. Materials for railway

4. Materials for tools, e.g. Hammer, drill and screwdriver etc.

5. Turbine blade in an areo-engine

6. Compressor disc in a jet engine

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