Chapter 7 Metal strengthening Mechanism MAT321 Dr. Haixue Yan
Strength of metals The structure of an alloy is influenced On the atomic scale Dislocation densities, vacancy concentrations Composition variations … On the micro scale Phase Grain shape and size distributions Both of them has significant influence on properties of alloys.
Mechanism: Microstructure hardening: Reduce Grain Size
Mechanism 2: Solid Solutions hardening Figure 7.16 Variation with nickel content of ( a ) tensile strength, ( b ) yield strength, and ( c ) ductility (%EL) for copper–nickel alloys, showing strengthening. Empirical relation:
Effects of Stress at Dislocations Adapted from Fig. 7.5, Callister 7e.
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- Spring '17
- Strength of materials, Work hardening, Strengthening mechanisms of materials