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Multi-Principal Element Alloy (MPEA)

Last updated: April 6, 2020

What Does Multi-Principal Element Alloy (MPEA) Mean?

A multi-principal metal alloy (MPEA) is defined as a metal alloy where the base alloy contains significant proportions of several metal elements. MPEAs typically consist of two or more base elements that may or may not be in equal concentrations. These metals are a relatively new development and are renowned for their improved properties over traditional alloys.

A multi-principal metal alloy may also be known as a compositionally complex alloy (CCA).


Corrosionpedia Explains Multi-Principal Element Alloy (MPEA)

Conventional alloys mainly consist of one principal element with minor property modifications made by adding relatively small proportions of other elements. While as many as a dozen additional elements may be included in conventional alloys, one base element possesses the majority atom fraction in the material.

MPEAs, on the other hand, consist of several base elements, usually in significant proportion. Typical MPEAs possess unique physical and mechanical properties, such as improved strength, ductility, corrosion resistance, thermal stability, durability and wear resistance.

As a result of these superior properties, MPEAs have become the focal point of many types of scientific research.


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