Effects of alloying elements on the Snoek-type relaxation in Ti-Nb-X-O alloys (X = Al, Sn, Cr, and Mn)

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• 作者：H. Lu^a ; C.X. Li^b ; F.X. Yin^b ; Q.F. Fang^a ; ^{qffang@issp.ac.cn} ; O. Umezawa^c
• 关键词：Snoek-type relaxation ; Ti&ndash ; Nb alloy ; Dipole shape factor ; d-Orbital energy ; Damping
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：15 April, 2012
• 卷：541
• 期：Complete
• 页码：28-32
• 文件大小：647 K

摘要

The effect of alloying elements on the oxygen Snoek-type relaxation in the Ti-24Nb-X-1.7O alloys (X = 1Al, 2Al, 1Sn, 2Sn, 2Cr, 2Mn) was investigated in order to develop high damping materials based on point defect relaxation process. The relaxation strength of the Ti-Nb-Al-O and Ti-Nb-Sn-O alloys is the highest while that of the Ti-Nb-Mn-O and Ti-Nb-Cr-O alloys is the lowest. The dipole shape factor (未位) and critical temperature T_c, which are intrinsic to the Snoek-type relaxation, were figured out and analyzed in terms of the d-orbital energy level (Md) for each alloy based on the measured damping peak. With the decreasing Md, the 未位 increases and saturates at last when the Md decreases to a certain value (about 2.435 eV), while the critical temperature T_c decreases linearly. The parameter Md can be taken as a key parameter in designing high damping 尾-Ti alloys, that is, to design an intermediate value of Md at which the values of both 未位 and T_c are as high as possible.