Influence of oxygen on microstructure and mechanical properties of directionally solidified Ti-47Al-2Cr-2Nb alloy
Influence of oxygen on microstructure and mechanical properties of directionally solidified Ti-47Al-2Cr-2Nb alloy
复制标题
氧对定向凝固Ti-47Al-2Cr-2Nb合金显微组织和力学性能的影响
DOI：
10.1016/j.matdes.2012.04.050
复制
发表时间：
2012-10-01
影响因子：
8.4
通讯作者：
Fu, Hengzhi
中科院分区：
文献类型：
--
作者：
Ding, Hongsheng;Nie, Ge;Fu, Hengzhi
研究了氧对Ti-47 Al-2Cr-2Nb合金定向凝固组织的影响。将氧含量在180至2360 wt.在电磁冷坩埚中获得ppm。氧含量的增加导致初生凝固β相转变为α相，最终取向垂直于生长取向的薄片体积分数增加。另外，氧含量的降低导致α（2）相体积分数的增加，从而导致片层组织的层间距减小。氧含量最低的定向凝固Ti-47 Al-2Cr-2Nb合金具有较低的维氏显微硬度和屈服强度，但室温塑性最高。(C)2012爱思唯尔有限公司保留所有权利。
The effect of oxygen on the microstructure of directionally solidified (DS) Ti-47Al-2Cr-2Nb alloy was investigated. The DS Ti-47Al-2Cr-2Nb ingots with oxygen contents ranging from 180 to 2360 wt. ppm were obtained in the electromagnetic cold crucible. Increasing the oxygen content led to a change of primary solidification beta phase to alpha phase and finally the volume fractions of lamellae with the orientation normal to the growth orientation would then increase. In addition, the decrease in oxygen content resulted in an increase in the volume fraction of alpha(2) phase, which led to a decrease in the interlamellar spacing of the lamellar structure. DS Ti-47Al-2Cr-2Nb alloy with lowest oxygen content exhibited a bit lower Vickers microhardness and the yield strength while showed highest ductility at room temperature. (C) 2012 Elsevier Ltd. All rights reserved.