The effect of oxidation on the subsurface microstructure of a Ti-6Al-4V alloy

被引：36

作者：

Bagot, P. A. J. ^{[1
]}

Radecka, A. ^{[2
,3
]}

Magyar, A. P. ^{[4
]}

Gong, Y. ^{[1
]}

Bell, D. C. ^{[4
]}

Smith, G. D. W. ^{[1
]}

Moody, M. P. ^{[1
]}

Dye, D. ^{[2
]}

Rugg, D. ^{[3
]}

机构：

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford, England

[2] Imperial Coll, Royal Sch Mines, Dept Mat, Prince Consort Rd, London, England

[3] Rolls Royce PLC, Elton Rd, London, England

[4] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

SCRIPTA MATERIALIA | 2018年 / 148卷

基金：

英国工程与自然科学研究理事会;

关键词：

Titanium alloys; Oxidation; Atom probe tomography; alpha-case; ALPHA TITANIUM-ALLOY; MECHANICAL-PROPERTIES; FIELD EVAPORATION; TI ALLOYS; PRECIPITATION; LIFE; ALPHA(2)-TI3AL; DIFFRACTION; PREDICTION; STABILITY;

D O I：

10.1016/j.scriptamat.2018.01.015

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Atom Probe Tomography (APT) and Transmission Electron Microscopy (TEM) are combined for examining a case formation in Ti-6Al-4V, generated by air exposure at 800 degrees C. Below the oxide surface, the microstructure separates into a nanoscale mixture of the alpha-Ti and alpha(2) Ti3Al phases, of compositions Ti70-030 and Ti65-010-A120-V5 respectively. The alpha(2) phase exists either as bands or as nanoscale spherical precipitates. Nitrogen also penetrates the surface, but to a lesser extent, while vanadium partitions to alpha(2) or in distinctly separate phases. The results demonstrate that oxygen stimulates precipitation of alpha(2), helping to explain embrittlement produced in the O-enriched layer beneath the oxide. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：24 / 28

页数：5

共 40 条

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