摘要
研究了Ti-24Al-15Nb-1.5Mo合金在900～1020℃,3.3×10-4～3.3×10-2s-1条件下进行的超塑性拉伸性能结果表明:除温度900℃,应变速率3.3×10-2s-1外,合金都显示出超塑性,延伸率范围为105%～1570%,最佳变形温度为980℃,最佳应变速率为3.3×10-4s-1,在此条件下拉伸时,延伸率达到最大值1570%。应变速率对Ti-24Al-15Nb-1.5Mo合金的组织演化有显著影响。在较高应变速率下变形,α2相尺寸先随温度升高至940℃有所减小,之后则随温度的升高有所粗化;而在较低的应变速率下变形,α2相呈粗化且不均匀的趋势,高的延伸率与大晶粒周围镶嵌许多小颗粒能有效协调变形。
The results of superplastic tension of Ti-24Al-15Nb-1.5Mo alloy under the conditions of 900-1020 ℃ and 3.3 × 10^-4-3.3× 10^-2 s^-1 show there is superplasticity for this alloy except the deformation condition of 900 ℃ and 3.3 × 10^-2 s^-1, in which the elongation varies from 105% to 1570%. The largest elongation of 1570% was obtained at the optimal superplastic deformation condition of 980 ℃, 3.3 × 10^-4 s^-1 . Strain rate has a significant effect on microstructural evolution during superplastic tension of Ti-24Al-15Nb-1.5Mo alloy. When the specimen is deformed at higher strain rate, the size of α2 phase decreased as temperature elevation in the range of 900-940 ℃ then increased as temperature elevation ones more. However, when the specimen is deformed at lower strain rate, there is a in uniform growth in the size of α2 phase, anti higher elongation is of concern to some small particles inserting around the large particles, which can accommodate deformation effectively.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第1期14-18,共5页
Rare Metal Materials and Engineering
