置氢处理对Ti40合金显微组织及相变的影响

Effect of Hydrogenation on Microstructure and Phase Transformation of Ti40 Alloy

摘要:

利用XRD、OM和TEM研究了β型阻燃合金Ti40置氢处理后的显微组织变化及相变过程。结果表明：随着氢含量的增加，Ti40合金中的基体β相逐渐减少，而晶体结构相同但元素组成不同的类β相逐渐增加。当氢含量达到0.3% (质量分数, 下同)以上时，晶界处析出细小的η相粒子。η相为面心立方结构，晶格常数a=0.4377 nm，成分可表示为：Ti: V: Cr = 38.10: 35.16: 26.66。Ti40合金的氢化过程及相变可表示为：低氢时(≤0.2%)：β→βH ;高氢时(>0.3%)：β→βH+modified β+η

Abstract:

Microstructure evolution and phase transformation of β phase Ti40 alloy before and after hydrogenation were investigated by XRD, OM, SEM, EDX and TEM. The results show that the amount of matrix β phase decreases while the modified β with the same bcc structure but different elemental composition increases gradually as the hydrogen content increases; the small particles of η phase appear around the grain boundaries when the hydrogen content reaches above 0.3%. The structure of η phase is fcc and the lattice constant is 0.4377 nm. The composition of η phase is Ti: V: Cr = 38.10: 35.16: 26.66. The hydrogenation and phase transformation of Ti40 alloy can be concluded as β→βH for low hydrogen content (≤0.2wt%) and β→βH+modified β+η for high hydrogen content (>0.3wt%)