Effect of cold rolling and recrystallization annealing on microstructure and mechanical properties of Ta-2.5W alloy
Ta-2.5W alloy was prepared by electron beam melting method,and the effect of different cold rolling deformations of 18.8％,48.5％and 75.8％on microstructure and mechanical properties of the Ta-2.5W alloy was studied.The effect of annealing on the microstructure,properties and texture of the cold-rolled Ta-2.5W alloy was also investigated.The results show that as the deformation increases,the grains of the alloy continue to flatten and elongate.Typical rolled fibrous structure is observed in the Ta-2.5W alloy with the deformation of 75.8％.The hardness and strength of the alloy continue to improve with the increase of deformation,due to work hardening.At the beginning of deformation,{ 111 }<110>and { 111 }<121>textures are formed in the alloy structure.As the deformation increases,{ 100 }<110>textures begin to appear,and { 111}<121>textures gradually disappear.When the deformation reaches 75.8％,the main texture is { 100 }<110>,leaving only a few { 111 }<110>textures.As the annealing temperature increases,the fibrous structure of the alloy gradually disappears,with a large number of equiaxed grains appearing and recrystallization occurring.The grain size and distribution become more uniform,and the texture strength gradually decreases.After annealing at 1450 ℃ for 1 h,the recrystallization ratio of the alloy reaches 95.7％,and the recrystallization is basically completed.At this time,the texture strength in the alloy significantly decreases,about 50％of that in the cold rolled state.After annealing,the strength of the alloy decreases,but the plasticity significantly increases,which is beneficial for its subsequent deformation processing.
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