The oxidation of nanocrystalline Ni3Al fabricated by mechanical alloying and spark plasma sintering

被引：40

作者：

Cao, Guojian

Geng, Lin

Zheng, Zhenzhu

Naka, Masaaki

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[2] Osaka Univ, Joining & Welding Res Inst, Osaka 5670047, Japan

来源：

INTERMETALLICS | 2007年 / 15卷 / 12期

关键词：

nickel aluminides; based on Ni3Al; nanostructured intermetallics; powder metallurgy; oxidation;

D O I：

10.1016/j.intermet.2007.07.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanocrystalline Ni3Al was fabricated through mechanical alloying of elemental powders and spark plasma sintering. The nanocrystalline Ni3Al has a nearly full density after being sintered at 1223 K for 10 min under a pressure of 65 MPa. Isothermal and cyclic oxidations of nanocrystalline Ni3Al were tested at 1173-1373 K with intervals of 100 K. The results indicate that nanocrystalline Ni3Al exhibits excellent isothermal and cyclical oxidation resistance. The oxide scales consist primarily of dense and continuous alpha-Al2O3. The g-rain refinement is beneficial for improving the oxidation resistance of Ni3Al by providing more nucleation centers for the Al2O3 formation, promoting the selective formation of Al2O3 and improving the adhesion of oxide scales to the matrix. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1672 / 1677

页数：6

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