Study of compression behaviour of a Cu-13Al-4Ni-xCr shape memory alloys prepared by powder metallurgy process

Abstract EN

In this study (Cu-13Al-4Ni-xCr) shape memory alloys have been prepared by using Powder metallurgy technique with added Cr element (x=0.3,0.6,0.9) .

After compacted , sintering process has been done in vacuum pressure (10-4torr) at ( 550oC for 120 minute) and ( 900oC for 60 minute) then cooling inside furnace.Quenching heat treatment carry out at (850oC for 60 minute) then cooling in cold water to (3-4oC) .

The microstructure has been studied by optical microscope and scanning electron microscope (SEM) , porosity , compression behavior(stress-strain) for quenched specimens also have been studied .The results have been approached that the hardness increases with percent chrome while the porosity decreases .

The compression stresses to fracture , have been increased with respect to (0.3%C) had porosity (27%) and decreased for (0.9%) has porosity (22%) .

from the previous results , quenched alloy (Cu-13%Al-4%Ni-0.3%Cr) is the more compression strength