Interface Stability in Diffusion Couple of L10 type TiAl and L12 type (Al, Mn)3Ti Alloys at 1273-1473 K
Interface Stability in Diffusion Couple of L10 type TiAl and L12 type (Al, Mn)3Ti Alloys at 1273-1473 K
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L10型TiAl和L12型(Al,Mn)3Ti合金在1273-1473 K扩散偶中的界面稳定性
DOI：
10.2320/matertrans.43.2600
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
L. Qiao
中科院分区：
文献类型：
--
作者：
Guangxi Jin;T. Kimura;Gao Kewei;K. Hashimoto;L. Qiao
在L10型钛铝合金表面制备三铝化钛涂层是提高其抗氧化性能的一种有效手段。选择含Mn的L1 2型三铝化钛合金作为涂层材料是特别有吸引力的，因为其在室温下良好的延展性和在1273 K的高温下良好的抗氧化性。然而，没有建立涂覆的三铝化钛在高温下的稳定性和对基材的粘附性。用含钒和不含钒的L10和L12单相合金组成的两种扩散偶，在1273-1473 K温度范围内进行了2.5- 20 h的扩散实验。在扩散过程中，L10和L12相共存，没有任何中间相，无论扩散温度和添加钒。由不含钒的合金组成的扩散偶在L10和L12相之间的界面处出现裂纹区，而由含钒的合金组成的扩散偶没有出现裂纹区。含钒的L12型合金是L10合金上的合适涂层材料。
Titanium trialuminide coating on L1 0 -type titanium aluminide alloys represents a valuable mean to improve oxidation resistance. Selection of L1 2 -type titanium trialuminide alloys containing Mn as a coating material is particularly attractive because of its good ductility at room temperature and good oxidation resistance at high temperature of 1273 K. However, stability of the coated titanium trialuminide at high temperature and adhesion to the substrate are not established. Two kinds of diffusion couples composed of L1 0 and L1 2 single phase alloys with or without vanadium were applied to diffusion experiments in a temperature range of 1273-1473 K for 2.5-20h. During the diffusion process, L1 0 and L1 2 phases coexisted without any inter-phase, irrespective of diffusion temperature and vanadium addition. The diffusion couples composed of the alloys without vanadium exhibited cracked region at the interface between the L1 0 and L1 2 phases, while the diffusion couples composed of the alloys with vanadium exhibited no cracked region. The L1 2 -type alloy with vanadium was shown to be an appropriate coating material on the L1 0 alloy.