Devitrification of Fe-Based Amorphous Metal SAM 1651: A Structural and Compositional Study

被引：26

作者：

Ha, Hung M. ^{[1
]}

Payer, Joe H. ^{[1
]}

机构：

[1] Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2009年 / 40A卷 / 11期

基金：

美国能源部;

关键词：

HIGH CORROSION-RESISTANCE; INTERGRANULAR CORROSION; MECHANICAL-PROPERTIES; CHROMIUM DEPLETION; GLASS-FORMATION; HEAT-TREATMENT; ALLOYS; EVOLUTION; YTTRIUM;

D O I：

10.1007/s11661-009-9977-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of heat treatment on the chemistry and structure of an Fe-based bulk metallic glass (BMG) Fe(48)Cr(15)Mo(14)C(15)B(6)y(2) (SAM 1651) was examined experimentally. Chemical segregation was found in the as-received material, with islands 10 to 200 nm in diameter enriched in Y, Mo, and C and depleted in Fe and Cr, with respect to the surrounding matrix. Heat treatment in the range of 600 degrees C to 800 degrees C caused partial devitrification of the BMG with the formation of nanocrystalline (Fe, Cr)(23)C(6) and (Fe, Cr)(7)C(3) carbides in a matrix of the remaining amorphous phase. The devitrification process followed a primary crystallization route. Amorphous particle-free zones (PFZs) in the devitrified material were found, corresponding to the Y-Mo-rich islands in the fully amorphous SAM 1651. The formation of Cr-rich carbide during devitrification caused the formation of nanometer-sized Cr-depleted zones surrounding the carbide particles, which is detrimental to the corrosion performance of the alloy after thermal exposure.

引用

页码：2519 / 2529

页数：11

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