On the microstructural factors affecting creep resistance of die-cast Mg-La-rare earth (Nd, Y or Gd) alloys

被引：57
作者：
Gavras, S. [1 ]
Zhu, S. M. [2 ]
Nie, J. F. [3 ]
Gibson, M. A. [2 ,3 ,4 ]
Easton, M. A. [2 ]
机构：
[1] Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr, Max Planck Str 1, Geesthacht, Germany
[2] RMIT Univ, Sch Aerosp Mech & Mfg Engn, Carlton, Vic 3053, Australia
[3] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
[4] CSIRO Mfg, Clayton, Vic 3168, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 675卷
关键词：
High-pressure die-cast; Heat treatment; Creep; Mg-rare earth; Microstructure; ELEVATED-TEMPERATURE APPLICATIONS; MAGNESIUM ALLOYS; HEAT-TREATMENT; RE ALLOYS; AL; PRECIPITATION; STRENGTH; BEHAVIOR; PHASE; SHAPE;
D O I：
10.1016/j.msea.2016.08.046
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Creep properties of high-pressure die-cast Mg-La-RE (Nd, Y or Gd) alloys, varying in ternary RE additions and in different heat treatment conditions, have been investigated. Through the use of short-term solution. treatments (1 h at 520 degrees C) it was shown that the continuous intermetallic phase present in the eutectic at grain boundaries became discontinuous. This effect, in combination with the likely removal of the localised region of supersaturated solute in solid solution near grain boundaries, reduced the creep resistance. When relatively high concentrations of ternary alloying additions were used, solid solution strengthening and precipitation hardening appeared to compensate for the negative effect of reduced grain boundary reinforcement. Microstructural investigation revealed that Nd-containing alloys had fewer and larger dynamic precipitates present in the alpha-Mg matrix following creep testing at 177 degrees C and 90 MPa. It was concluded that grain boundary reinforcement in combination with the thermal stability of the precipitates formed, which is ultimately related to the diffusivity of solute in solid solution, are also contributing factors to creep resistance. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：65 / 75
页数：11
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