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首页> 外文会议>International Workshop on Advanced Metallic Materials and Processing Techniques for Aeronautical Applications; 20051118-20; Nanjing(CN) >Mechanical properties and oxidation formation of EB-PVD deposited Ni-Cr-Al alloy
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Mechanical properties and oxidation formation of EB-PVD deposited Ni-Cr-Al alloy

机译：EB-PVD沉积Ni-Cr-Al合金的力学性能和氧化形成

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摘要

Ni-20Cr-0.6Al(molar fraction, %) alloy sheet with 0.2 mm in thickness was deposited at 900℃ from a target of Ni-Cr-Al alloy by EB-PVD. The grain size of as-deposited alloy was less than 100 nm. The mechanical properties of alloys were examined using room tensile tests. The ultimate tensile strength of as-deposited and annealed films was 780 MPa and 767 MPa, respectively. Investigation of fracture surfaces from samples reveals that brittle fracture takes place along boundaries of columnar crystals formed on the substrate side, while the equiaxed dimples are dominant on the evaporation side. Oxide formation of Ni-20Cr-0.6Al alloy after 100 h oxidation at 1 000℃ in air was studied. The results indicate that a continuous and dense α-Al_2O_3 scale is formed after 100 h oxidation for as-deposited alloy, while a complex oxide scale, consisting of the outer oxide layer of Cr_2O_3, NiO and NiCr_2O_4 and the inner oxide layer of Al_2O_3, forms for annealed alloy.
机译：通过EB-PVD在900℃下从Ni-Cr-Al合金的靶上沉积厚度为0.2mm的Ni-20Cr-0.6Al（摩尔分数，％）合金板。所沉积的合金的晶粒尺寸小于100nm。使用室内拉伸试验检查了合金的机械性能。沉积和退火膜的极限抗拉强度分别为780 MPa和767 MPa。对样品断裂面的研究表明，脆性断裂是沿着基体一侧形成的柱状晶体的边界发生的，而等轴凹窝则在蒸发侧占主导。研究了Ni-20Cr-0.6Al合金在1000℃空气中氧化100h后的氧化物形成。结果表明，沉积态合金经过100 h氧化后，形成连续致密的α-Al_2O_3氧化皮，而复合氧化物氧化皮由Cr_2O_3，NiO和NiCr_2O_4的外氧化层和Al_2O_3的内氧化层组成，退火合金的形式。

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