What are key differences between Dispersion strengthening and precipitation hardening?
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What are key differences between Dispersion strengthening and precipitation hardening?
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Precipitation Hardening is termed as age or particle hardening. It is a technique involving the heat treatment of malleable material to increase their yield strength. Dispersion strengthening is referred to as the method of growing the toughness of a metallic object by presenting the second phase wiRead more
Precipitation Hardening is termed as age or particle hardening. It is a technique involving the heat treatment of malleable material to increase their yield strength.
Dispersion strengthening is referred to as the method of growing the toughness of a metallic object by presenting the second phase with the addition of an alloying part.
The major differences between dispersion strengthening and precipitation hardening are:
- The hardening strengthening effect is not retained at elevated temperature for precipitation hardening however it dies for dispersion hardening.
- The strength is developed by heat treatment for precipitation hardening which is not the case of dispersion hardening.
- The dispersion strengthening has the small secondary phase particles that are precipitated to a ductile matrix by mixing and consolidation with the help of powder metallurgy techniques whereas in precipitation hardening the particles are precipitated to a solid form with the help of solution treating and subsequent quenching of the alloy.
See lessPrecipitation hardening products spefic alloy it is isotropic. Eg : Duralumin Dispersion strengthening are any alloy can be made it is anisotropic Eg: composite materials
Precipitation hardening products spefic alloy it is isotropic. Eg : Duralumin
Dispersion strengthening are any alloy can be made it is anisotropic
See lessEg: composite materials
Dispersion strengthened is a powder metallurgy route in which metal powder + 10% metal oxide (SAP, SUP etc.) follows the procedure of heavy compacting, sintering, necking, coalescence etc. Conventional refractory bricks like alumina, fire clay, magnesia are made likewise. Precipitation/age hardeningRead more
Dispersion strengthened is a powder metallurgy route in which metal powder + 10% metal oxide (SAP, SUP etc.) follows the procedure of heavy compacting, sintering, necking, coalescence etc. Conventional refractory bricks like alumina, fire clay, magnesia are made likewise.
See lessPrecipitation/age hardening is the metal and alloying element is taken in suspension and quenched, eg. Al + 4%Cu–> suspended in dil. acid–> quenched–> alpha + CuAl2 precipitates. To make it moderate hard, better tensile strength & %elongation ageing is done for longtime. Slow cooling and super saturated solution will undergo GP2–>GP1–>GP zone to accommodate Al in third dimension with Cu. Duralumin is made likewise.
Both involves strengthening the material by fine particles. In precipitation hardening excess solute will be rejected in the form of precipitates into the matrix when we quench it after solutionizing treatment provided sufficient aging time is given. Precipitation hardened materials loose their streRead more
Both involves strengthening the material by fine particles.
In precipitation hardening excess solute will be rejected in the form of precipitates into the matrix when we quench it after solutionizing treatment provided sufficient aging time is given.
Precipitation hardened materials loose their strength at higher temperatures. Bcoz of the following reasons.
Precipitate growth takes place so no.of precipates decreases and interprecipitate space increases. So dislocations can easily bypass these precipitates.
In dispersion strengthening we deliberately add oxide partices to get dispersed in the matrix. These oxide particles doesn’t dissolve in the matrix there by retain the strength of the material even at elevated temperatures. Grain coarsening is also not takes place. These oxide particles pin down the migrating grain boundaries at high temperature.
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