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Oxidation characteristics of Ti-14Al-21Nb alloy at high temperature in purified oxygen; Ti-14Al?-21Nb gokin no sansochu ni okeru koon sanka tokusei

Journal Article:

Abstract

The Ti-14Al-21Nb alloy called Super {alpha}{sub 2} is an alloy which has been improved of plastic transformation ability by adding Nb into Ti3Al with high specific strength, and is used for member materials in aircraft engines. In order to identify its oxidation characteristics, this paper discusses the oxidation characteristics under purified oxygen and atmospheric pressure in temperatures ranging from 1000 K to 1300 K. The experiment made a button-formed ingot with a diameter of 50 mm and a thickness of about 10 mm by melting and thermal refining, and used a thermobalance. Main conclusion thus obtained may be summarized as follows: the amount of increase due to oxidation after 100 ks oxidation at 1000 K is very small; oxidation between 1100 K and 1200 K follows nearly the parabolic rate laws; the scale consisted mainly of rutile, but a thin alumina concentration layer is formed; Nb is concentrated in the rutile-alumina mixed layer, and local fracture and regeneration are repeated at temperatures higher than 1300 K. 21 refs., 8 figs., 2 tabs.
Authors:
Akai, M; Taniguchi, S; Shibata, T [1] 
  1. Osaka University, Osaka (Japan). Faculty of Engineering
Publication Date:
Oct 20, 1994
Product Type:
Journal Article
Reference Number:
SCA: 360105; 320201; 420500; 330100; PA: NEDO-94:914948; EDB-95:071247; SN: 95001387731
Resource Relation:
Journal Name: Nippon Kinzoku Gakkaishi (Journal of the Japan Institute of Metals); Journal Volume: 58; Journal Issue: 10; Other Information: PBD: 20 Oct 1994
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 33 ADVANCED PROPULSION SYSTEMS; TERNARY ALLOY SYSTEMS; TITANIUM; ALUMINIUM; NIOBIUM; OXIDATION; CONTROLLED ATMOSPHERES; OXYGEN; TEMPERATURE RANGE 1000-4000 K; TURBOFAN ENGINES; AIRCRAFT; MECHANICAL PROPERTIES; DENSITY; PLASTICITY; THERMAL GRAVIMETRIC ANALYSIS; SCALING; ALUMINIUM OXIDES; ENRICHMENT; SEGREGATION; FRACTURES; HEALING
OSTI ID:
43533
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: NIKGAV; ISSN 0021-4876; TRN: 94:914948
Submitting Site:
NEDO
Size:
pp. 1169-1176
Announcement Date:
May 25, 1995

Journal Article:

Citation Formats

Akai, M, Taniguchi, S, and Shibata, T. Oxidation characteristics of Ti-14Al-21Nb alloy at high temperature in purified oxygen; Ti-14Al?-21Nb gokin no sansochu ni okeru koon sanka tokusei. Japan: N. p., 1994. Web.
Akai, M, Taniguchi, S, & Shibata, T. Oxidation characteristics of Ti-14Al-21Nb alloy at high temperature in purified oxygen; Ti-14Al?-21Nb gokin no sansochu ni okeru koon sanka tokusei. Japan.
Akai, M, Taniguchi, S, and Shibata, T. 1994. "Oxidation characteristics of Ti-14Al-21Nb alloy at high temperature in purified oxygen; Ti-14Al?-21Nb gokin no sansochu ni okeru koon sanka tokusei." Japan.
@misc{etde_43533,
title = {Oxidation characteristics of Ti-14Al-21Nb alloy at high temperature in purified oxygen; Ti-14Al?-21Nb gokin no sansochu ni okeru koon sanka tokusei}
author = {Akai, M, Taniguchi, S, and Shibata, T}
abstractNote = {The Ti-14Al-21Nb alloy called Super {alpha}{sub 2} is an alloy which has been improved of plastic transformation ability by adding Nb into Ti3Al with high specific strength, and is used for member materials in aircraft engines. In order to identify its oxidation characteristics, this paper discusses the oxidation characteristics under purified oxygen and atmospheric pressure in temperatures ranging from 1000 K to 1300 K. The experiment made a button-formed ingot with a diameter of 50 mm and a thickness of about 10 mm by melting and thermal refining, and used a thermobalance. Main conclusion thus obtained may be summarized as follows: the amount of increase due to oxidation after 100 ks oxidation at 1000 K is very small; oxidation between 1100 K and 1200 K follows nearly the parabolic rate laws; the scale consisted mainly of rutile, but a thin alumina concentration layer is formed; Nb is concentrated in the rutile-alumina mixed layer, and local fracture and regeneration are repeated at temperatures higher than 1300 K. 21 refs., 8 figs., 2 tabs.}
journal = {Nippon Kinzoku Gakkaishi (Journal of the Japan Institute of Metals)}
issue = {10}
volume = {58}
journal type = {AC}
place = {Japan}
year = {1994}
month = {Oct}
}