Ti6Si2B, a new ternary phase in the Ti-Si-B system

被引：47

作者：

Ramos, AS

Nunes, CA

Rodrigues, G

Suzuki, PA

Coelho, GC

Grytsiv, A

Rogl, P

机构：

[1] Dept Mat Engn, DEMAR, FAENQUIL, BR-12600970 Lorena, SP, Brazil

[2] Univ Vale Paraiba, Inst Pesquisa & Desenvolvimento, BR-12244000 Sao Jose Dos Campos, SP, Brazil

[3] Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria

来源：

INTERMETALLICS | 2004年 / 12卷 / 05期

关键词：

titanium silicides; phase diagrams; crystallography;

D O I：

10.1016/j.intermet.2004.01.001

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：

A detailed investigation of the phase relations in the Ti-Si-B system involving as-cast and heat-treated samples that were characterized via X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Wavelength Dispersive Spectroscopy (WDS) microprobe analysis has shown the existence of a new ternary phase of composition Ti6Si2B. Rietveld refinement of X-ray powder intensity data revealed a hexagonal crystal Structure, with lattice parameters a=0.68015 nm and c=0.33377 nm and proved isotypism with the Ni6Si2B-phase (FeP-type structure, Zr6CoGa2 ternary variant). The Ti6Si2B-phase forms from the liquid through the peritectic reaction: L + TiB + Ti5Si3 double left right arrow Ti6Si2B. At 1200 degreesC it forms narrow two-phase fields with Ti-SS Ti5Si3 and TiB. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：487 / 491

页数：5

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