Grain Boundary and Intragranular Reactions during Aging in Mg-Al System Alloys Poured into Sand and Iron Molds

被引：7
作者：
Furui, Mitsuaki [1 ]
Ebata, Yuhei [2 ]
Yamada, Hiroshi [2 ]
Ikeno, Susumu [1 ]
Sakakibara, Katsuya [3 ]
Saikawa, Seiji [3 ]
机构：
[1] Toyama Univ, Grad Sch Sci & Engn Res, Toyama 9308555, Japan
[2] Toyama Univ, Grad Sch Sci & Engn Educ, Toyama 9308555, Japan
[3] Ahresty Corp, Toyohashi, Aichi 4413114, Japan
来源：
MATERIALS TRANSACTIONS | 2011年 / 52卷 / 03期
关键词：
magnesium-aluminum system alloys; grain boundary and intragranular reactions; age hardening behavior; sand and iron molds; BEHAVIOR; CAST; LI;
D O I：
10.2320/matertrans.MB201011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
It is well-known that age hardening occurs in Mg-Al system alloys, when the alloy containing aluminum exceeds 6 mass%. This precipitation reaction depends on the aluminum content and aging temperature. The aging behavior in AZ91 magnesium alloy was investigated and it is the subject of this paper. However, for the Mg-Al system alloys, the influence of aluminum content on age hardening characteristics has not been researched in detail so far. In this study, continuous and discontinuous precipitations during aging in Mg-Al system alloys cast into sand and iron molds was investigated by means of hardness measurement and microstructure observation with optical microscope and transmission electron microscope. The microstructure of AM60 magnesium alloy with 6 mass% containing aluminum in the as cast condition was composed with a primary crystallized alpha magnesium phase and beta Mg17Al12 phase. The hardness of cellular precipitates existing near the grain boundary in sand mold castings decreased with increasing the aging time. On the other hand, the hardness of intragranular precipitates was constant against the aging time. Variation of hardness with aging was found to be caused mainly by the discontinuous precipitation along the grain boundaries from the composite rule in hardness. In iron mold castings, it was found that the variation of hardness with aging was found to be caused mainly by the continuous precipitation inside the crystal grain. [doi:10.2320/matertrans.MB201011]
引用
收藏
页码：285 / 291
页数：7
相关论文
共 15 条
  • [1] Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li or Y
    Agnew, SR
    Yoo, MH
    Tomé, CN
    [J]. ACTA MATERIALIA, 2001, 49 (20) : 4277 - 4289
  • [2] Microstructures and properties of nanocomposites obtained through SPTS consolidation of powders
    Alexandrov, IV
    Zhu, YT
    Lowe, TC
    Islamgaliev, RK
    Valiev, RZ
    [J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1998, 29 (09): : 2253 - 2260
  • [3] Aging characteristics and high temperature tensile properties of Mg-Gd-Y-Zr alloys
    Anyanwu, IA
    Kamado, S
    Kojima, Y
    [J]. MATERIALS TRANSACTIONS, 2001, 42 (07) : 1206 - 1211
  • [4] AUNE T, 1995, 950424 SAE, P332
  • [5] DULY D, 1995, ACTA METALL MATER, V43, P101, DOI 10.1016/0956-7151(94)00230-F
  • [6] Ebata Y., 2010, P 5 JAP CHIN NORW CO, P97
  • [7] Improving the superplastic properties of a two-phase Mg-8% Li alloy through processing by ECAP
    Furui, M
    Xu, C
    Aida, T
    Inoue, M
    Anada, H
    Langdon, TG
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 410 : 439 - 442
  • [8] Furui M., 2009, 117 C JAP I LIGHT ME, P139
  • [9] Solute content and the tensile bhavior of high pressure die cast Mg-Al alloys
    Nagasekhar, A. V.
    Caceres, C. H.
    [J]. PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3, 2007, 561-565 : 333 - +
  • [10] Novel ultra-high straining process for bulk materials - Development of the accumulative roll-bonding (ARB) process
    Saito, Y
    Utsunomiya, H
    Tsuji, N
    Sakai, T
    [J]. ACTA MATERIALIA, 1999, 47 (02) : 579 - 583
12