Cerium was added in AZ31 alloy with the contents of 0.4%,0.8%and 1.2%respectively to produce experimental alloys. The grain refinement of Ce in the as-cast and rolled AZ31 alloy were studied by using Polyvar-MET optic...Cerium was added in AZ31 alloy with the contents of 0.4%,0.8%and 1.2%respectively to produce experimental alloys. The grain refinement of Ce in the as-cast and rolled AZ31 alloy were studied by using Polyvar-MET optical microscope with a VSM2000 quantitative analysis system,KYKY2000 SEM and Tecnai G^2 20 TEM.And the mechanical properties of AZ31+Ce alloy were tested on a CSS-44100 testing system with computerized data acquisition.The results show that the cerium has a good grain refinement effect on the as-cast AZ31 alloy because cerium can build up a solute enriched zone rapidly during the solidification process.The dynamic recrystallization(DRX) grains less than 10μm can be obtained in hot rolled AZ31+Ce alloy.A cold rolling deformation degree over than 20%and a following annealing at 400℃for 1 h will lead to refine and uniform grains with the sizes of about 25μm.The cerium can form dispersed and thermally stable Al_4Ce phase that can prohibit the coarsening of grains in AZ31+Ce alloy during the hot rolling and annealing process.展开更多
基金Project(2006BAE04B02-3)supported by the National Science and Technology Support Program during the 11th Five-Year Plan of China
文摘Cerium was added in AZ31 alloy with the contents of 0.4%,0.8%and 1.2%respectively to produce experimental alloys. The grain refinement of Ce in the as-cast and rolled AZ31 alloy were studied by using Polyvar-MET optical microscope with a VSM2000 quantitative analysis system,KYKY2000 SEM and Tecnai G^2 20 TEM.And the mechanical properties of AZ31+Ce alloy were tested on a CSS-44100 testing system with computerized data acquisition.The results show that the cerium has a good grain refinement effect on the as-cast AZ31 alloy because cerium can build up a solute enriched zone rapidly during the solidification process.The dynamic recrystallization(DRX) grains less than 10μm can be obtained in hot rolled AZ31+Ce alloy.A cold rolling deformation degree over than 20%and a following annealing at 400℃for 1 h will lead to refine and uniform grains with the sizes of about 25μm.The cerium can form dispersed and thermally stable Al_4Ce phase that can prohibit the coarsening of grains in AZ31+Ce alloy during the hot rolling and annealing process.
