Gd元素含量对砂型铸造Mg-Gd-Y合金微观组织和力学性能的影响
Effect of Gd Addition on Microstructure and Mechanical Properties of Sand Casting Mg-Gd-Y System Alloys
查看参考文献25篇
|
文摘
|
通过金相观察(OM)、扫描电镜观察(SEM)、能谱分析(EDS)、拉伸试验研究了Gd元素含量对砂型铸造Mg-Gd-Y系合金微观组织和力学性能的影响,并引入WE54合金作为对比。研究表明:Mg-Gd-Y系合金的铸态组织主要由等轴树枝晶α-Mg固溶体、晶界处孤岛状共晶相Mg_(24)(Gd,Y)_5以及孤立的方块相Mg_5(Gd,Y)和起到晶粒细化作用的富Zr核心组成。随着Gd含量的增加,晶界处第二相Mg_(24)(Gd,Y)_5的体积分数明显增加,导致合金的抗拉强度和屈服强度不断提高,伸长率却不断降低。GW94合金强度最好:室温下抗拉强度和屈服强度最高分别可达213.7 MPa和156 MPa,伸长率却仅为1.29%。WE54合金的伸长率最高,这可能与铸态WE54合金晶界处形成的相互平行的片层状共晶相有关。Mg-Gd-Y系合金和WE54合金断裂机制都为准解理断裂。 |
|
其他语种文摘
|
The microstructure and mechanical properties of sand casting Mg-Gd-Y system alloys were investigated by optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectrometer (EDS) and tensile tests, and the WE54 Mg alloy was also introduced as a comparison. The results show that the microstructure of as-cast Mg-Gd-Y system alloys were mainly composed of equiaxed dendrite of α-Mg solid solution, isolated island-like eutectic phase ofMg_(24)(Gd,Y)_5 at the grain boundaries, isolated square particles of Mg_5(Gd,Y) and Zr-rich core playing a role in grain refinement. As the content of Gd addition to Mg-Gd-Y alloy increased, the ultimate tensile strength and yield strength increased gradually, while the elongation reduced gradually. The strength improvement was attributed to increase of the volume fraction ofMg_(24)(Gd,Y)_5 at the grain boundaries. The strength of GW94 alloy was highest in present four alloys, and the tensile strength, yield strength and elongation at room temperature was 213.7 MPa, 156 MPa and 1.29%, respectively. The elongation of WE54 alloy was the highest, which may be due to its lamellar eutectic phase at the grain boundaries. The fracture modes of Mg-Gd-Y alloy and WE54 Mg alloy were both quasi-cleavage fracture. |
|
来源
|
铸造
,2015,64(9):887-892 【扩展库】
|
|
关键词
|
Mg-Gd-Y合金
;
微观组织
;
力学性能
;
砂型铸造
|
|
地址
|
1.
沈阳大学机械工程学院, 辽宁, 沈阳, 110044
2.
中国科学院金属研究所, 辽宁, 沈阳, 110016
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1001-4977 |
|
学科
|
金属学与金属工艺 |
|
基金
|
国家重点基础研究发展计划(973计划)
;
国家自然科学基金
|
|
文献收藏号
|
CSCD:5531366
|
参考文献 共
25
共2页
|
|
1.
刘正.
镁基轻质合金理论基础及其应用,2002
|
被引
227
次
|
|
|
|
|
2.
Cerri E. The influence of high temperature exposure on aging kinetics of a die cast magnesium alloy.
Materials letters,2002,56(5):716-720
|
被引
6
次
|
|
|
|
|
3.
Jing B. Effect of extrusion on microstructures,and mechanical and creep properties of Mg-Al-Sr and Mg-Al-Sr-Ca alloys.
Scripta Materialia,2006,55(12):1163-1166
|
被引
4
次
|
|
|
|
|
4.
Watanabe H. Mechanical properties of Mg-Al-Ca alloy processed by hot extrusion.
Materials Science and Engineering: A,2007,454:384-388
|
被引
11
次
|
|
|
|
|
5.
Zhang Y. Effects of yttrium on microstructure and mechanical properties of hot-extruded Mg-Zn-Y-Zr alloys.
Materials Science and Engineering: A,2004,373(1):320-327
|
被引
69
次
|
|
|
|
|
6.
Wang Q. Effects of aging on the microstructures and mechanical properties of extruded AM50+xCa magnesium alloys.
Rare Metals,2006,25(4):377-381
|
被引
1
次
|
|
|
|
|
7.
Lim H K. Effect of grain size on the tensile deformation of wrought Mg-MM-Al-Zn-Sn alloy.
Materials Letters,2008,62(15):2271-2274
|
被引
6
次
|
|
|
|
|
8.
任英磊. Ca对铸态Mg-6A1及Mg-6A1-2Si系合金组织与性能的影响.
铸造,2013,61(12):1383-1387
|
被引
2
次
|
|
|
|
|
9.
Chino Y. Mechanical properties at elevated temperature of a hot-deformed Mg-Al-Ca-Mn-Sr alloy.
Materials Science and Engineering: A,2007,452:31-36
|
被引
3
次
|
|
|
|
|
10.
Guo X F. Reciprocating extrusion of rapidly solidified Mg-6Zn-lY-0.6Ce-0.6 Zr alloy.
Journal of Materials Processing Technology,2007,187:640-644
|
被引
18
次
|
|
|
|
|
11.
Nie J F. Enhanced age hardening response and creep resistance of Mg-Gd alloys containing Zn.
Scripta Materialia,2005,53(9):1049-1053
|
被引
73
次
|
|
|
|
|
12.
Peng Q M. Microstructures and properties of Mg-7Gd alloy containing Y.
Journal of Alloys and Compounds,2007,430(1):252-256
|
被引
27
次
|
|
|
|
|
13.
Gao L. Effects of rare-earth elements Gd and Y on the solid solution strengthening of Mg alloys.
Journal of Alloys and Compounds,2009,481(1):379-384
|
被引
94
次
|
|
|
|
|
14.
He S M. Precipitation in a Mg-10Gd-3 Y-0.4 Zr (wt.%) alloy during isothermal ageing at 250 ℃.
Journal of Alloys and Compounds,2006,421(1):309-313
|
被引
107
次
|
|
|
|
|
15.
He S M. Microstructure and strengthening mechanism of high strength Mg-10Gd-2Y-0.5 Zr alloy.
Journal of Alloys and Compounds,2007,427(1):316-323
|
被引
146
次
|
|
|
|
|
16.
杨忠. Gd和Y含量对Mg-Gd-Y-0.5Zr合金组织性能的影响.
铸造,2013,62(6):545-548
|
被引
4
次
|
|
|
|
|
17.
Wang J. Effect of Y for enhanced age hardening response and mechanical properties of Mg-Gd-Y-Zr alloys.
Materials Science and Engineering: A,2007,456(1):78-84
|
被引
54
次
|
|
|
|
|
18.
Zhang K. Effect of Gd content on microstructure and mechanical properties of Mg-Y-RE-Zr alloys.
Transactions of Nonferrous Metals Society of China,2008,18:s12-s16
|
被引
11
次
|
|
|
|
|
19.
.
GB/T 228.1-2010.金属材料拉伸试验第1部分:室温试验方法,2010
|
被引
4
次
|
|
|
|
|
20.
高磊.
高强度铸造Mg-Gd-Y-Zr合金的成分设计,固溶强化及沉淀强化机理研究,2010:71-83
|
被引
1
次
|
|
|
|
|
了解气象卫星更多信息，请访问