Effects of laser shock processing on θ-Al2O3 to α-Al2O3 transformation and oxide scale morphology evolution in (γ’+β) two-phase Ni-34Al-0.1Dy alloys
Effects of laser shock processing on θ-Al2O3 to α-Al2O3 transformation and oxide scale morphology evolution in (γ’+β) two-phase Ni-34Al-0.1Dy alloys
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激光冲击加工对(γ-β)两相Ni-34Al-0.1Dy合金中α-Al2O3向α-Al2O3转变和氧化皮形貌演化的影响
DOI：
10.1016/j.jmst.2021.09.028
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发表时间：
2021-11
影响因子：
10.9
通讯作者：
郭洪波
中科院分区：
文献类型：
--
作者：
周邦阳;何健;周琪杰;郭洪波
（γ′+β）两相Ni-Al与单相β- nial相比，Al含量低，与高温合金具有良好的界面相容性，是一种很有前途的高温保护涂层材料。为了提高Ni-34Al-0.1Dy （γ′+β）两相Ni-Al合金的抗氧化性能，采用激光冲击处理（LSP）对Ni-34Al-0.1Dy进行了处理，研究了其在1150℃下的氧化行为。结果表明：氧化后，未处理合金的β相上形成了晶粒尺寸较小（200 ~ 800 nm）的al2o3结垢，而经过lsp处理的β相上形成了晶粒尺寸为2 ~ 3 μm的较大al2o3晶粒。这一差异归因于LSP促进了θ- al2o3向α-Al2O3的转变，因为在LSP处理过程中，位错密度和表面粗糙度都增加了，这可以为α-Al2O3提供非均相成核的位置。此外，在氧化初期，针状θ- al2o3直接转化而成的大尺寸al2o3颗粒可以迅速覆盖整个β相表面，从而降低了水垢的生长速度。
(γ’+β) two-phase Ni-Al is a promising high-temperature protective coating material used on Ni-base superalloys since it has good interfacial compatibility with superalloys due to the low Al content compared to single-phase β-NiAl. In this paper, we aim to improve the oxidation resistance, whereby Ni-34Al-0.1Dy, a (γ’+β) two-phase Ni-Al alloy, was treated by laser shock processing (LSP) and the oxidation behavior at 1150 °C was investigated. The results showed that after oxidation, Al2O3scale formed on the original β phase of the untreated alloy with a small grain size (200–800 nm), while for the LSP-treated samples, the scale grown on the original β phase was dominantly composed of larger Al2O3grains with a size of 2–3 μm. The distinction was attributed to the promotion of θ-Al2O3to α-Al2O3transformation induced by the LSP, because the dislocation density, as well as surface roughness, were increased during LSP treatment which can provide heterogeneous nucleation sites for α-Al2O3. In addition, the larger-size Al2O3particles, derived from the direct conversion of needle-like θ-Al2O3in the initial oxidation stage, could rapidly overspread the whole β phase surface thus reducing the scale growth rate.
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