Study on the Microstructure and Mechanical Properties of Aluminum Copper Alloy by Squeezing Casting
The effect of different Mn/Fe ratio and extrusion pressure on the microstructure and mechanical properties of Al-Cu alloy was studied by means of metallographic microscope,scanning electron microscope,and tensile testing machine,and the research revealed the existing form and effect mechanism of iron rich phase in Al-Cu alloy.The results showed that there existed needle like beta-Fe(Al7Cu2Fe)phase and bulk Al7Cu2(FeMn)phase in T5 heat treated Al-Cu alloy.With the increase of the proportion of Mn/Fe,the volume fraction of bulk Al7Cu2(FeMn)phase increased gradually,while the volume fraction of acicular beta-Fe phase decreased gradually,and when the ratio of Mn/Fe was 1.2 and 1.5,only bulk Al7Cu2(FeMn)phase in the alloy.Compared to the Al-Cu alloy with extrusion pressure of 0,the iron rich phase in Al-Cu alloy with the same Mn/Fe ratio was more fine and dispersed after applying 75 MPa extrusion pressure.When the extrusion pressure was 0,Al-Cu alloy got the maximum value of the tensile strength,yield strength and elongation with the Mn/Fe ratio was 1.2.When the extrusion pressure was 25 MPa and 75 MPa,Al-Cu alloy got the maximum value of the tensile strength and yield strength with the Mn/Fe ratio was 0.9,and the elongation slightly decreased with the increasing proportion of Mn/Fe,which were mainly related to the type,size and distribution of iron rich phase in the alloy.
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