Phase constitution and heat treatment behavior of titanium-manganese alloys

Masahiko Ikeda, Masato Ueda, Ryuichi Matsunaga, Michiharu Ogawa, Mitsuo Niinomi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Although titanium is considered to be a ubiquitous element since it has the tenth highest Clarke number of all elements, it is classified as a rare metal because the current refinement process is more environmentally damaging than the processes used to refine iron and aluminum. Furthermore, the beta stabilizing elements of titanium alloys (e.g., V, Mo, Nb, and Ta) are very expensive due to their low crustal abundances. Manganese is also considered to be a ubiquitous element, since it has the 12th highest Clarke number of all elements. Therefore, manganese is a promising alloying element for titanium, especially as a beta-stabilizer. In order to develop beta titanium alloys as ubiquitous metallic materials, it is very important to investigate the properties of Ti-Mn alloys. In this study, the phase constitution of and the effect of heat treatment on Ti-3.3 to 8.7 mass% Mn alloys were investigated by electrical resistivity and Vickers hardness (HV) measurements and by X-ray diffraction (XRD) analysis and optical microscopy. In 3.3, 5.1, and 6.0 mass% Mn alloys quenched from 1173 K, α' martensite and β phase were identified by XRD, whereas in the 8.7 mass% alloy, only the β phase was detected. The resistivities at both temperatures increased with increasing Mn content up to 6.0 mass% Mn and the positive temperature dependence of resistivity became negative at 6.0 mass% Mn. ρLN increased gradually with increasing Mn content up to 8.7 mass% Mn, whereas rRT decreased considerably at a Mn content of 8.7 mass% Mn. HV increased with increasing Mn content up to 5.1 mass%, after which it began to decrease. In Ti-3.3 mass%Mn and 5.1 mass%Mn alloys, the resistivity and the resistivity ratio decreased with increasing temperature of isochronal heat treatment because of decomposition of α' martensite. In 6.0Mn and 8.7Mn alloys, the resistivity and the resistivity ratio decreased, while Vickers hardness increased with increasing temperature of isochronal heat treatment because of isothermal ω precipitation. Furthermore, the temperature for the onset of precipitation increased with higher Mn content.

Original languageEnglish
Title of host publicationTHERMEC 2009
EditorsTara Chandra, Tara Chandra, Tara Chandra, N. Wanderka, N. Wanderka, N. Wanderka, Walter Reimers, Walter Reimers, Walter Reimers, M. Ionescu, M. Ionescu, M. Ionescu
PublisherTrans Tech Publications Ltd
Pages425-430
Number of pages6
ISBN (Print)0878492941, 9780878492947
DOIs
Publication statusPublished - 2010 Jan 1
Externally publishedYes
Event6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
Duration: 2009 Aug 252009 Aug 29

Publication series

NameMaterials Science Forum
Volume638-642
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
CountryGermany
CityBerlin
Period09/8/2509/8/29

Keywords

  • Electrical resistivity
  • Isochronal heat treatment
  • Isothermal omega
  • Ubiquitous metallic elements
  • Vickers hardness

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Ikeda, M., Ueda, M., Matsunaga, R., Ogawa, M., & Niinomi, M. (2010). Phase constitution and heat treatment behavior of titanium-manganese alloys. In T. Chandra, T. Chandra, T. Chandra, N. Wanderka, N. Wanderka, N. Wanderka, W. Reimers, W. Reimers, W. Reimers, M. Ionescu, M. Ionescu, & M. Ionescu (Eds.), THERMEC 2009 (pp. 425-430). (Materials Science Forum; Vol. 638-642). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.638-642.425