sigma phase

sigma phase

[′sig·mə ‚fāz]
(metallurgy)
A brittle, nonmagnetic phase of tetragonal structure occurring in many transition-metal alloys; frequently encountered in high chromium stainless steels.
References in periodicals archive ?
Kinetics of sigma phase formation in a duplex stainless steel, Materials Research 12: 321-327.
Sigma phase morphologies in cast and aged super duplex stainless steel, Materials Characterization 60(8): 792-795.
Table 1: Five Steps to Audit Success Six Sigma Phase Corresponding Internal Audit Phase Define Planning Measure Performance Analyze Analysis Improve (redesign) Recommendations Control Follow-up
The new powder metallurgy nitrogenated stainless steel alloys are single phase (austenite) with no tendency to form the embrittling nitride and sigma phase compounds often found in high nitrogen stainless steels.