摘要
研究了Ti2Al Nb基合金Ti-22Al-（27-x）Nb-x Zr（x=0,1,6,at%）在650~800℃的氧化行为。采用XRD和SEM等测试技术对此温度区间形成的氧化层特征进行了分析。结果表明,相比Ti-22Al-27Nb,含锆合金具有较好的抗氧化性能。Ti-22Al-（27-x）Nb-x Zr合金在650℃氧化100 h,主要氧化产物为Ti O2,而在800℃氧化100 h,Ti O2,Al2O3和Al Nb O4为主要产物,但是在Ti-22Al-21Nb-6Zr合金中还有Zr O2生成。Ti-22Al-26Nb-1Zr合金具有优异抗氧化性能,归因于氧化产物细化形成了致密的氧化层,而Ti-22Al-21Nb-6Zr合金,虽然在800℃也形成了较多Al2O3,但是氧化层中的Zr O2为氧的快速扩散提供通道,进而导致该合金氧化增重明显。
The oxidation behavior of Ti-22Al-（27-x）Nb-x Zr（x=0, 1, 6, at%） was evaluated over a temperature range of 650~800 oC in air. The phase composition and the morphology of the formed scales were investigated by X-ray diffraction and scanning electron microscopy. The results show that the alloys containing Zr exhibit better oxidation resistance than Ti-22Al-27 Nb alloy. The main oxidation product is Ti O2 for all the alloys oxidized at 650 oC for 100 h. A mixture of Ti O2, Al2O3 and Al Nb O4 is formed for Ti-22Al-27 Nb and Ti-22Al-26Nb-1Zr oxidized at 800 oC for 100 h; however, Zr O2 is also traced in Ti-22Al-21Nb-6Zr. The improved oxidation resistance for Ti-22Al-26Nb-1Zr can be ascribed to the refinement of oxides. While in Ti-22Al-21Nb-6Zr alloy,although formation of Al2O3 is obvious at 800 oC, Zr O2 in the scale can provide sites for rapid oxygen transport, leading to the high mass gain.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第2期261-266,共6页
Rare Metal Materials and Engineering
基金
National Basic Research Program of China(2011CB605503)
