Microstructures and mechanical properties of Nbss/Nb5Si3 in-situ composite prepared by electromagnetic cold crucible directional solidification

被引：30

作者：

Kang, Yongwang ^{[1
]}

Yan, Yuncheng ^{[1
,2
]}

Song, Jinxia ^{[1
]}

Ding, Hongsheng ^{[2
]}

机构：

[1] Beijing Inst Aeronaut Mat, Sci & Technol Adv High Temp Struct Mat Lab, Beijing 100095, Peoples R China

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 599卷

关键词：

Intermetallics; Microanalysis; Mechanical characterization; FRACTURE-TOUGHNESS; POWDER COMPACTS; SYSTEM; AL;

D O I：

10.1016/j.msea.2014.01.077

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The Nb-ss/Nb5Si3 in-situ composite with the nominal composition of Nb-24Ti-12Si-4Cr-4Al-2Hf (at%) has been successfully fabricated by electromagnetic cold crucible directional solidification. Microstructures of the initial transition (IT) zone and the steady-state growth (SSG) region were observed by scanning electron microscope, and their phase compositions were analyzed with X-ray diffraction (XRD). The room temperature fracture toughness and the tensile strength at 1250 degrees C were measured. The results indicated that from IT zone to SSG zone, the major silicide transferred from gamma-(Nb,Ti)(5)Si-3 to beta-(Nb,Ti)(5)Si-3. The directional solidification microstructure with coupled Nb-ss and Nb5Si3 was created in SSG region. Compared SSG region with IT zone, the room temperature fracture toughness and the high temperature tensile strength increased about 50% and 24%, respectively, which was contributed to the directional solidification microstructure and the type transformation of silicide. (C) 2014 Elsevier ay. All rights reserved.

引用

页码：87 / 91

页数：5

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