Dislocations and Strengthening Mechanisms topics include: Dislocations concept, lattice strain, slip systems, strengthening mechanisms, recovery and grain growth. Dislocations are linear defects in the crystal lattice of crystalline materials, such as metals and ceramics. They cause plastic deformations in materials by multiplying themselves and moving to cause a macroscopic deformation. Strengthening mechanisms increase the hardness, tensile strength, and yield strength of a material by prohibiting the mobility of numerous dislocations. Some strengthening mechanisms... Show more Dislocations and Strengthening Mechanisms topics include: Dislocations concept, lattice strain, slip systems, strengthening mechanisms, recovery and grain growth. Dislocations are linear defects in the crystal lattice of crystalline materials, such as metals and ceramics. They cause plastic deformations in materials by multiplying themselves and moving to cause a macroscopic deformation. Strengthening mechanisms increase the hardness, tensile strength, and yield strength of a material by prohibiting the mobility of numerous dislocations. Some strengthening mechanisms include: Precipitation hardening: Precipitates form in the metal when the concentration of the alloying element exceeds its solid solubility limit in the base metal. The precipitates restrict the movement of dislocations and thereby increase strength. Strain hardening: This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material. Due to strain hardening, yield strength increases and ductility decreases. Grain-boundary strengthening: This is the strengthening of a polycrystalline material owing to the presence of grain boundaries in its microstructure. A grain boundary may be considered as an array of dislocations. Other strengthening mechanisms include: Dislocation motion, Edge dislocation, Fiber strengthening, Martensite strengthening. Related Test: Material Science Practice Test: Structure of Crystalline Solids Show less
Dislocations and Strengthening Mechanisms topics include: Dislocations concept, lattice strain, slip systems, strengthening mechanisms, recovery and grain growth.
Dislocations are linear defects in the crystal lattice of crystalline materials, such as metals and ceramics. They cause plastic deformations in materials by multiplying themselves and moving to cause a macroscopic deformation.
Strengthening mechanisms increase the hardness, tensile strength, and yield strength of a material by prohibiting the mobility of numerous dislocations.
Some strengthening mechanisms include: Precipitation hardening: Precipitates form in the metal when the concentration of the alloying element exceeds its solid solubility limit in the base metal. The precipitates restrict the movement of dislocations and thereby increase strength. Strain hardening: This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material. Due to strain hardening, yield strength increases and ductility decreases. Grain-boundary strengthening: This is the strengthening of a polycrystalline material owing to the presence of grain boundaries in its microstructure. A grain boundary may be considered as an array of dislocations.
Other strengthening mechanisms include: Dislocation motion, Edge dislocation, Fiber strengthening, Martensite strengthening.
Related Test: Material Science Practice Test: Structure of Crystalline Solids
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