Microstructural and mechanical characteristics of zirconium alloy joints brazed by a Zr-Cu-Al-based glassy alloy

被引：21

作者：

Lee, Jung G. ^{[1
]}

Lee, M. K. ^{[1
]}

机构：

[1] Korea Atom Energy Res Inst, Nucl Mat Dev Div, Taejon 305353, South Korea

来源：

MATERIALS & DESIGN | 2015年 / 65卷

关键词：

Glassy alloy; Zirconium alloy; Brazing characteristic; Microstructure; Bonding strength; CORROSION; ZIRCALOY-4; BEHAVIOR; TEMPERATURE; EVOLUTION; METAL; FE;

D O I：

10.1016/j.matdes.2014.09.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Brazing characteristics of a Zr(Ti)-Cu(Fe)-Al glassy alloy was investigated using a Zircaloy-4 alloy as a base metal. A low melting temperature (solidus: 840 degrees C, liquidus: 880 degrees C) of the brazing alloy was obtained at the near-eutectic composition of Zr55Ti5Cu25Fe5Al10 (at.%) designed by a partial replacement of Zr by Ti, and Cu by Fe from a well-known Zr60Cu30Al10 ternary alloy. This quinary brazing alloy exhibited excellent melting and wetting characteristics and good compatibility with the base metal. At brazing temperatures below the liquidus of the brazing alloy, the joint consisted of a relatively fine dendritic structure (alpha-Zr + Zr2Cu) with a massive segregation of Zr2Cu in the central zone by a eutectic solidification of the molten brazing alloy during a cooling stage, whereas a homogeneous joint was obtained at 890 degrees C with a predominant formation of acicular alpha-Zr phases holding an intercellular lamellar mixture (alpha-Zr + Zr2Cu), which was produced by an isothermal solidification during a brazing holding time. The mechanical properties of the joints were strongly dependent on a degree of joint homogeneity, and the bonding strength of the joints was high enough to cause a fracture in the Zircaloy-4 base metal, when the central segregation of massive Zr2Cu was completely eliminated at the brazing temperature of 890 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：265 / 271

页数：7

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