Toughness level of 6061 aluminum alloy added with Mn instead of Cr

M. Niinomi, T. Akahori, K. Fukunaga, S. Kumai, M. Kanno

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Tensile strength and 0.2% proof stress of T6-treated modified 6061 aluminum alloys with 0.4 and 0.8 mass% Mn instead of 0.25 mass% Cr are nearly equal to those of T6-treated non-modified 6061 aluminum alloy when water-quenching is conducted after solution treatment at 803 K for 1.8 ks after homogenization at 803 K for 36 ks. Crack initiation energy, EIi, obtained from Charpy impact tests on T6-treated modified 6061 aluminum alloys, where Mn between 0.4 and 0.8 mass % is substituted for 0.25 mass % Cr tends to increase slightly with increasing the content of Mn and cooling rate. While static fracture toughness, Jin, obtained from static fracture toughness tests on T6-treated modified 6061 aluminum alloys tends to be constant with increasing the content of Mn and to increase with increasing cooling rate after solution treatment. The relationship between EIi or Jin and tensile strength of T6-treated modified and non-modified 6061 aluminum alloys shows a positive linear one in the range of tensile strength from 250 MPa to 350 MPa. T6-treated modified 6061 aluminum alloy, where 0.4 mass% Mn is substituted for 0.25 mass% Cr, shows the best balance of strength and toughness. It is possible to substitute Mn for Cr in non-modified 6061 aluminum alloy by judging from the point of view of the balance of strength and toughness when WQ is conducted after solution treatment at 803 K for 1.8 ks after homogenization at 803 K for 36 ks.

Original languageEnglish
Pages (from-to)1399-1404
Number of pages6
JournalMaterials Science Forum
Volume396-402
Issue number3
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes
EventAluminium Alloys 2002 Their Physical and Mechnaical Properties: Proceedings of the 8th International Conference ICAA8 - Cambridge, United Kingdom
Duration: 2002 Jul 22002 Jul 5

Keywords

  • Crack initiation energy
  • Static fracture toughness
  • Tensile property and 6000 series aluminum alloys

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Toughness level of 6061 aluminum alloy added with Mn instead of Cr'. Together they form a unique fingerprint.

  • Cite this