【摘要】 为系统了解Ti-15-3合金的超塑性,研究了固溶态和两种不同变形量冷轧态的Ti-15-3合金板材在700~800℃和1×10-4~3×10-3s-1应变速率范围内的超塑性行为.结果表明:Ti-15-3合金具有较好的超塑性能,冷轧态合金的延伸率均优于固溶态,且随着板材冷轧变形量的增大而增大;各应变速率下,该合金都在780℃时获得最大延伸率和应变速率敏感性指数.在780℃和1×10-4s-1条件下拉伸时,冷轧变形量为52%的Ti-15-3合金板材获得了370%的延伸率,m值为0.56;变形温度和速率对合金的超塑性能影响很大,合金的延伸率在730~780℃范围内随温度的升高和应变速率的降低而升高,合金的流变应力则随之下降.更多还原

【Abstract】 In order to understand the superplasticity of Ti-15-3 alloy,superplastic behaviors of Ti-15-3 alloy with different status were investigated at 700～800 ℃ and strain rates ranging from 1×10-4s-1 to 3×10-3s-1.The results show that the alloys exhibit good superplasticity.The elongation of all the cold rolled sheet is better than that of the solution treated sheet under the same deformation conditions,and it increases with the increasing of the cold rolled strain of the sheet.The largest elongation and strain rate sensitivity exponent are gained at 780 ℃,and this temperature is the optimal deformation temperature of this alloy.52% cold rolled sheet gets the largest elongation of 370% in the condition of 780 ℃ and 1×10-4s-1,and m is 0.56.Deformation temperature and strain rate affect the superplasticity of Ti-15-3 alloy severely.The elongation of this alloy increases with the increasing of temperature and the descending of strain rate at 730～780 ℃,but flow stress descends.更多还原