Search
×

Sign up

Use your Facebook account for quick registration

OR

Create a Shvoong account from scratch

Already a Member? Sign In!
×

Sign In

Sign in using your Facebook account

OR

Not a Member? Sign up!
×

Sign up

Use your Facebook account for quick registration

OR

Sign In

Sign in using your Facebook account

Shvoong Home>Science>Precipitation mechanisms of intermetallic compounds in W-Mo-Ni-Fe heavy alloys Summary

Precipitation mechanisms of intermetallic compounds in W-Mo-Ni-Fe heavy alloys

Article Summary   by:TsingHua     Original Author: Powder Metallurgy Technology
ª
 
In order to investigate the effect of Mo on the microstructural evolution of W Ni Fe heavy alloys, phase composition, and precipitation mechanism of intermetallic compound, alloys with binder matrixes of the same composition but different ratios of W to Mo (Mo: 15 at%~59 at%) were liquid phase sintered The analysis of phases was carried out using SEM, EPMA, XRD, and DTA Results indicated that the increased concentration of Mo in the matrix, as a result of increased ratio of Mo in the alloy, not only reduced the solidification temperature of the matrix phase from 1415 ℃ to 1336 ℃, but also promoted the formation of intermetallic  (W,Mo) 0 5- x (Ni,Fe) 0 5+ x , (x= 0 ~ 0 04) compound The atomic ratio of Mo in this intermetallic compound was found to increase linearly with the atomic ratio of Mo in the alloy, but the precipitation temperature of this intermetallic compound was very consistent, ranging from 1349 ℃ to 1355 ℃ Due to such varying phase transformation temperatures, the phase transformation temperature of the intermetallic compound was determined by the atomic ratio of Mo to Mo and W (M Mo /M W+M Mo ) in the alloy It is a monoeutectic reaction when this ratio is higher than 0 66, or eutectic reaction when this ratio ranges between 0 5 and 0 66 When this ratio is between 0 34 and 0 5, the precipitation of the intermetallic compound is either eutectoid or peritectoid No intermetallic compound was found for a ratio lower than 0 2
Published: January 01, 2005   
Please Rate this Summary : 1 2 3 4 5
Translate Send Link Print
X

.