利用金属型铸造制备了原位自生Mg2Si/Mg-Al基复合材料,研究了热处理对该材料组织与性能的影响.结果表明:T4处理改变了Mg2Si/Mg-Al基复合材料中Mg2Si的形貌与分布.随着保温时间的延长,棱状枝晶Mg2Si相发生熔断、球化,最终成为尺寸为10-30 μm的颗粒;同时β-Mg17Al12相溶入到α-Mg基体中,在随后的时效过程中发生沉淀析出.由于β-Mg17Al12相的溶解,T4处理会降低该材料的硬度,但随后的时效析出可提高其硬度,415℃×12 h固溶处理后175℃×16 h(T6)时效,硬度可提高14.9%.热处理过程中棱状枝晶Mg2Si相的粒化可用吉布斯-汤姆逊定理解释.
参考文献
| [1] | Mordike B L;Ebert T .Magnesium properties application potential[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2001,302:37-45. |
| [2] | 刘正;张奎;曾小勤.镁基轻质合金理论基础及其应用[M].北京:机械工业出版社,2002:195-201. |
| [3] | Zhang J;Fan Z;Wang Y Q et al.Microstructural development of Al-15vol% Mg2Si in-situ composite with mischmetal addition[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2000,281(01):104-112. |
| [4] | Wood J V;Davies P;Kellie J L K .Properties of reactively cast aluminium-TiB2 alloys[J].Materials Science and Technology,1993,9(09):833-840. |
| [5] | Murthy V S R;Rao B S .Microstructure development in the directed melt-oxidized(DIMOX) Al-Mg-Si alloys[J].Materials Science,1995,30(12):3091-3097. |
| [6] | B. Bronfin;M. Katsir;E. Aghion .Preparation and solidification features of AS21 magnesium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(1):46-50. |
| [7] | 徐春杰,张忠明,郭学锋,贾树卓,刘礼,孟令楠.热挤压AZ91D镁合金的组织与力学性能[J].西安理工大学学报,2005(04):356-360. |
| [8] | Lu Y Z;Wang Q D;Zeng X Q et al.Behavior of Mg-6Al-xSi alloys during solution heat treatment at 420℃[J].MATERIALS SCIENCE & ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2001,301:255-258. |
| [9] | 金云学,张二林,曾松岩,朱兆军.热处理对Ti-6Al-2C合金中TiC枝晶形貌的影响[J].材料工程,2001(08):18-21. |
| [10] | 冯端.金属物理学--第2卷相变[M].北京:科学出版社,1990:150-152. |
| [11] | 刘云旭.金属热处理原理[M].北京:机械工业出版社,1981:44-47. |
| [12] | 刘正;刘重阳;王中光 等.固溶和时效对压铸AZ91HP合金力学性能的影响[J].金属学报,1999,35(08):869-873. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%