Study on Microstructure Evolution and Tensile Properties of TC11 Titanium Alloy under Different Cooling Conditions AITranslate

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Chinese Library Classification Number:TG156.1[金属学及工艺—热处理]

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TC11 titanium alloy,which had been heat-treated at temperatures in the two-phase region and the single-phase region respectively,was treated using three different cooling methods:water cooling,air cooling,and furnace cooling.The microstructure evolution and tensile properties of the TC11 titanium alloy under different cooling conditions were studied.The results show that after heat treatment of the alloy at the two-phase region temperature,the microstructures after water cooling and air cooling exhibit high similarity,mainly composed of primaryαphase+α'phase and primaryαphase+secondaryαphase,while the primaryαphase in the microstructure after furnace cooling is larger in size and higher in content.After heat treatment of the alloy at the single-phase region temperature and cooling,the primaryαphase disappears in the microstructures obtained by all three cooling methods,andβgrains emerge.The alloy subjected to air cooling has the highest strength but relatively poor plasticity,while the alloy treated with furnace cooling has the lowest strength but relatively high plasticity.Under different cooling conditions,the strength of the alloy is greater after treatment at the single-phase region temperature,whereas the plasticity is better after treatment at the two-phase region temperature.When the alloy is heated to the two-phase region temperature,the fracture characteristic of the alloy treated by different cooling methods is mainly equiaxed dimples,which is typical ductile fracture.When the alloy is heated to the single-phase region temperature,the tensile fractures of the alloy treated by different cooling methods show microscopic characteristic dominated by a rock-like appearance,which is typical brittle fracture.