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首页> 外文会议>Pacific Rim International Conference on Advanced Materials and Processing(PRICM 5) pt.1; 20041102-05; Beijing(CN) >Oxidation of Four NiAl-Ag Alloys at 900℃ in 1 atm O_2
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Oxidation of Four NiAl-Ag Alloys at 900℃ in 1 atm O_2

机译：1 atm O_2中900℃下四种NiAl-Ag合金的氧化

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摘要

Small amounts of silver have been added to the intermetallic compound β-NiAl for the purpose of improving its mechanical properties. Four ternary NiAl-Ag alloys NiAl-0.5Ag, NiAl-1Ag, NiAl-5Ag and NiAl-10Ag (at.%), and an Ag-free β-NiAl have been oxidized at 900℃ for 24 h in 1 atm O_2 to study the effect of the presence of silver on the oxidation of β-NiAl. The kinetics of all the alloys were generally composed of two main parabolic stages with slightly larger parabolic rate constants for the second stage, except for NiAl-10Ag, which has an instantaneous parabolic rate constant decreasing with time. A continuous external layer of Al_2O_3 formed on all the alloys. In particular, the scales formed on NiAl-5Ag and NiAl-10Ag contained a thin and discontinuous layer of silver at the alloy/Al_2O_3 interface. Furthermore, NiAl-10Ag formed also isolated Ag particles or even a discontinuous Ag layer occasionally surmounting the Al_2O_3 scale. The addition of minor amounts of silver does not affect significantly the oxidation of β-NiAl, because silver is essentially present as a second phase due to its very small solubility in this intermetallic compound.
机译：为了改善其机械性能，已经向金属间化合物β-NiAl中添加了少量的银。四种三元NiAl-Ag合金NiAl-0.5Ag，NiAl-1Ag，NiAl-5Ag和NiAl-10Ag（at。％）和无银的β-NiAl在1 atm O_2中于900℃氧化了24小时。研究银的存在对β-NiAl氧化的影响。所有合金的动力学通常由两个主要的抛物线阶段组成，第二阶段的抛物线速度常数稍大，NiAl-10Ag除外，后者的瞬时抛物线速度常数随时间降低。在所有合金上形成连续的Al_2O_3外层。特别地，在NiAl-5Ag和NiAl-10Ag上形成的氧化皮在合金/ Al_2O_3界面处包含薄且不连续的银层。此外，NiAl-10Ag还形成了孤立的Ag颗粒，甚至形成了不连续的Ag层，偶尔会超过Al_2O_3氧化皮。少量的银的添加不会显着影响β-NiAl的氧化，因为由于银在该金属间化合物中的溶解度非常小，因此它基本上作为第二相存在。

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