13 research outputs found
The integration of clinical and costing information : a comparative study between Scotland and Sweden
The measurements of correlation times of molecules adsorbed on silica gel, alumina and charcoal using NOESY and MAS NMR
THE ROLE OF ACCOUNTING INFORMATION IN A REFORMING AREA: A STUDY OF HIGHER EDUCATION INSTITUTIONS
Effects of Rare Earth Element Additions on the Impression Creep Behavior of AZ91 Magnesium Alloy
Creep processes in magnesium alloys and their composites
A comparison is made between the creep characteristics of two squeeze-cast magnesium alloys (AZ 91 and QE 22) reinforced with 20 vol pct Al2O3 short fibers and the unreinforced AZ 91 and QE 22 matrix alloys. The results show the creep resistance of the reinforced materials is considerably improved by comparison with the unreinforced matrix alloys. It is suggested that creep strengthening in these short-fiber composites arises primarily from the existence of a threshold stress and the effect of load transfer. By testing samples to failure, it is demonstrated that the unreinforced and reinforced materials exhibit similar times to failure at the higher stress levels. A detailed microstructural investigation by transmission electron microscopy (TEM) reveals no substantial changes in matrix microstructure due to the presence of the reinforcement. This suggests that direct composite strengthening dominates over indirect effects