Based on the performance requirements of Fe-Cu powder metallurgy products

the Fe-0.2 Cu alloy was prepared by unidirectional pressing method with different pressing parameters including pressing force and pressing speed at the determined sintering temperature.And microstructure

densification process and mechanical properties of the Fe-0.2 Cu alloy were analyzed by means of XRD

OM

SEM.The results show that the binding degree and the spheroidization degree in particles are increased while the interface size and the porosity are decreased with the increase of pressure

and the more uniform structure in the alloy can be observed.The maximum density

tensile strength and microhardness value of the prepared alloy reach up to 6.9 g/cm

3

605 MPa at 1 140℃ and 230 HV

respectively

with the pressing pressure of 600 MPa and pressing speed of 5.0 m/s.Iron matrix exists widely in form of single element.Fe atoms and Cu atoms are diffused to form phase such as Fe

4

Cu

3

Cu

9.9

Fe

0.1

which are located at cracks or surface and some of which oxidized to generate Fe

3

O

4

、FeO and CuO.The tensile fracture morphology shows that the pore shape of fracture is changed from coarse and irregular to small and regular sphere

which present the mixed characteristics of dimple

cleavage surface

tearing ridge and cleavage fluvial pattern.The fracture mode is changed from brittle fracture features to brittle-ductile with the increased force.