Superplasticity of multiphase fine-grained Nb-16Si-2Fe refractory alloy

被引：15

作者：

Yu, J. L. ^{[1
]}

Zhang, K. F. ^{[1
]}

Wang, G. F. ^{[1
]}

机构：

[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

来源：

INTERMETALLICS | 2008年 / 16卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Silicides; various; Superplastic behaviour; Plastic deformation mechanisms; Powder metallurgy; Microstructure;

D O I：

10.1016/j.intermet.2008.06.008

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：

Nb-16Si-2Fe refractory alloy consisting of an Nb solid solution and intermetallic phases Nb3Si, Nb5Si3 and Nb4Fe3Si5 was synthesized by hot press sintering to yield a fine microstructure with all four phases being in the size range of micrometer. This alloy exhibits excellent superplasticity with the presence of a significant amount of liquid phase Nb4Fe3Si5 at a temperature which is 91 degrees C higher than the solidus temperature of 1359 degrees C. A tensile elongation of 512% is measured at 1450 degrees C. Microstructures of the deformed specimen and the DSC (differential scanning calorimetry) analysis indicate that the dominant mechanism for superplastic deformation is viscous flow of the liquid phase Nb4Fe3Si5. This superplastic phenomenon is apparently different from that observed in conventional magnesium-based and aluminum-based composites in which the superplastic deformation is grain boundary sliding but the sliding strain was accommodated by liquid phases. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1167 / 1170

页数：4

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