An alloy made with very small quantities of elements.
For microalloys the boundary can be treated as a thin layer of the segregating element including segregating impurities. In the case of nanoalloys, the segregation pattern can involve a significant part of the whole grain.2020, Florent Calvo, Nanoalloys: From Fundamentals to Emergent Applications, page 194:
2
An element used in very small quantities in an alloy.
Today, the use of niobium as a microalloy is estimated to account for about 95% of production.1992, Advanced Materials & Processes, volume 142, page 34:
microalloy
verb
Etymology From micro- + alloy.
1
To add elements to an alloy in much smaller quantities than normal.
The purpose of this step is to microalloy the aluminum and gold metallizations into the silicon to insure the lowest possible contact resistance […]1978, T. F. Leedy, Yan M. Liu, Microelectronic Processing Laboratory at NBS (volume 13, page 23)