Creep of dispersion-strengthened alloys

• Published in: Materials science and engineering 1980-01, Vol.46 (1), p.75-87
• Main Authors: Sellars, C.M., Petkovic-Luton, R.A.
• Format: Article
• Language: English
• ISSN: 0025-5416
• DOI: 10.1016/0025-5416(80)90192-5

The importance of dispersed second-phase particles in providing strengthening of alloys both at room temperature and at high temperatures has long been recognized and the effects of dispersoids have been the subject of many research studies. These studies have led to a considerable understanding of the role of particles but inconsistencies still remain both in the experimental observations and in the interpretation of these observations. The purpose of this review is to examine the characteristics of high temperature creep of dispersion-strengthened alloys from the viewpoint of the possible mechanism involved. Three mechanisms of plastic deformation are distinguished and discussed. Specifically, these are examined in relation to oxide-dispersion-strengthened nickel-based alloys as these have potentially good high temperature corrosion resistance and useful creep resistance to high fractions of their melting points. These attractive properties at temperatures in excess of about 1000°C, where the useful creep strength of creep-resisting steels and superalloys rapidly diminishes, offer what at present appears to be the most technologically feasible development of materials for engineering applications at temperatures of 1100°C and above.