Effect of Adding Carbon Powder on Microstructure and Mechanical Properties of AZ91 Magnesium Alloy
The effect of different content of carbon powder refiner on the microstructure and mechanical properties of AZ91 magnesium alloy was studied.The microstructure observation,SEM analysis and mechanical property test of AZ91 alloy were carried out.The results show that with the increase of the refiner content,the grain size of AZ91 alloy decreases significantly.When 0.5wt%refiner is added,the grain size of AZ91 alloy is reduced to 184 μm,and the refinement efficiency reaches 67%.When 0.3wt%refining agent is added,the tensile strength and elongation of AZ91 alloy reach the highest of 150 MPa and 2.1%,which are increased by 28%and 50%,respectively,compared with those without adding refining agent.The Al4C3 phase is obtained by the reaction of C element and Al element,which can be used as the heterogeneous nucleation site of AZ91 alloy,and it plays a role in grain refinement,and significantly improves the mechanical properties of AZ91 alloy.
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