Microstructure and Vickers hardness of mechanically alloyed and spark plasma sintered Ti-2Zn-22Si-11B and Ti-6Zn-22Si-11B alloys

被引：2

作者：

Ferreira, Nelson Damasio ^{[1
]}

Leal Neto, Ricardo Mendes ^{[2
]}

Filgueira, Marcello ^{[3
]}

Ferreira, Lucas Moreira ^{[4
]}

Rodrigues Pais Alves, Manuel Fellipe ^{[4
]}

Trindade Ramos, Erika Coaglia ^{[1
]}

Nunes, Carlos Angelo ^{[4
]}

dos Santos, Claudinei ^{[4
]}

Ramos, Alfeu Saraiva ^{[1
]}

机构：

[1] Univ Fed Alfenas, Inst Ciencia & Tecnol, Rod Jose Aurelio Vilela 11999, BR-37715400 Pocos De Caldas, MG, Brazil

[2] Inst Pesquisas Energet & Nucl, Ctr Ciencia & Tecnol Mat, Ave Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP, Brazil

[3] Univ Estadual Norte Fluminense, Ctr Ciencia & Tecnol, Ave Alberto Lamego 200, BR-28013602 Campos Dos Goytacazes, RJ, Brazil

[4] Univ Sao Paulo, Dept Engn Mat, Polo Urboind, Gleba AI-6, BR-12600970 Lorena, SP, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 794卷

基金：

巴西圣保罗研究基金会;

关键词：

Ti6Si2B; Zinc; Mechanical alloying; Spark plasma sintering; PHASE;

D O I：

10.1016/j.jallcom.2019.04.172

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：

This work reports on effect of zinc and milling time on microstructure and Vickers hardness of mechanically alloyed and spark plasma sintered (66,7-x)Ti-xZn-22,2Si-11,1B alloys (at.-%, with x = 2 and 6 at.-%). Ball milling at different times (20, 60, 180 and 300 min) was performed under argon atmosphere in a planetary ball mill from these elemental powder mixtures. Cylinder bodies with 10 mm diameter were consolidated by spark plasma sintering (1100 degrees C, 12 min, 20 MPa) under argon atmosphere. Asmilled powders and sintered Ti-Zn-Si-B samples were evaluated by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry, laser diffraction particle size analysis, and Vickers hardness tests. It was noted a similar behavior during ball milling of Ti-Zn-Si-B powder mixtures. Only the alpha-Ti and Si peaks were indexed in XRD patterns of Ti-Zn-Si-B powders milled for 300 min. Rietveld refining indicated that the amount of amorphous structures has increased during milling up to 300 min, which was more pronounced for the Ti-6Zn-22Si-116 powders. The particle sizes of the Ti-2Zn-22Si-11B and Ti-6Zn-22Si-11B powder mixtures increased during milling from 94 (20 min) to 156 (300 min) mu m and from 101 (20 min) to 136 (300 min) mu m, respectively. Coherently, the average specific surface area of powder particles was continuously reduced during milling. Despite the adopted parameters, the SPS process produced dense Ti-xZn-22Si-11B (x = 2 and 6 at.-%) alloys with 98% from their theoretical specific mass. Regardless of milling time, the Ti6Si2B formation was inhibited in microstructure of the spark plasma sintered Ti-6Zn-22Si-11B alloy previously milled for longer times. EDS analysis indicated that the Ti6Si2B phase dissolved close to 1.8 at.-% Zn. Beside the TiB and Ti5Si3, the Ti2Zn and Ti3Zn (not explored) phases were also found in microstructure of sintered Ti-Zn-Si-B alloys. The Ti-2Zn-22Si-11B alloy presented average Vickers hardness values higher than 1050 HV whereas the Ti-6Zn-22Si-11B alloy varied between 970 and 1036 HV, which could be associated with the Ti6Si2B formation. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：615 / 624

页数：10

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