Materials in which dislocations can move easily are those which tend to be soft and subject to easy plastic deformation. On the other hand, hard and strong materials can be obtained if it is difficult for dislocations to move.
Strain Hardening is when a metal is strained beyond the yield point. An increasing stress is required to produce additional plastic deformation and the metal apparently becomes stronger and more difficult to deform.
Properties are recorded during a tensile test?
Properties that are directly-measured via a tensile test are ultimate tensile strength, breaking strength, maximum elongation and reduction in area. From these measurements, the following properties can also be determined: Young’s modulus, Poisson’s ratio, yield strength, and strain-hardening characteristics.
Definition. In the mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation. The field of strength of materials deals with forces and deformations that result from their acting on a material.
Necking, in engineering or materials science, is a mode of tensile deformation where relatively large amounts of strain localize disproportionately in a small region of the material. The resulting prominent decrease in the local cross-sectional area provides the basis for the name “neck”.