Microstructure and Mechanical Properties of Die Casting AlSiFeMnMgCuSc-xZr Alloy
Tensile specimens of Al-9Si-0.6Fe-0.2Mn-0.2Mg-0.6Cu-0.3Sc-xZr(x=0,0.1,0.2,0.3,mass frac-tion,%)were prepared by horizontal die casting machine under non-vacuum conditions.The as-cast microstructure and mechanical properties of the alloy were investigated by metallographic microscope,scanning electron microscope,electron probe and electronic universal material testing machine.The results indicate that Zr addition can enhance the structure refinement and modification of alloy,and the tensile strength,elongation and hardness of the alloy is increased firstly and then decreased with the increase of Zr content.When 0.2%Zr is added,the primary α-Al phase has optimal refining effect,which is transformed from flower-like to fine dendrite.The eutectic Si phase also achieves desirable modification effect,which is transformed from worm-like to granular phase.The tensile strength,elongation and microhardness of as-cast alloy reach the maximum value,which are 289.3 MPa,4.9%and 114.3 HV,respec-tively,and the tensile fracture mode is characterized by ductile fracture.
Al-Si Die Casting AlloyZrMicrostructureMechanical Properties
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