采用扫描电镜(SEM)、显微硬度分析、X-ray衍射和差热分析(DTA)技术研究了Ti-46at%Al混合粉末机械合金化过程中的显微组织演变.结果表明:随着球磨过程的进行,Ti-46at%Al颗粒逐渐等轴化,粒度变小,粒度分布变窄;显微硬度增大,硬度分布和颗粒内成分逐渐均匀.经过60h高能球磨,Al元素完全固溶入Ti晶格内,形成纳米Ti(Al)过饱和固溶体,同时,有非晶相形成;球磨至100h,形成完全非晶相.非晶相的形成是界面处非平衡扩散的结果,在Ti-46at%Al合金中,机械合金化致非晶的晶粒条件是:晶粒尺寸≤15nm.
参考文献
| [1] | Yamaguchi M;Umakoshi Y .The Deformation of Intermetallic Superlattic Compounds[J].Progress in Materials Science,1990,34:1. |
| [2] | 陆永浩,张永刚,乔利杰,王燕斌,陈昌麒,褚武扬.全层状TiAl基合金断裂机制原位观察[J].稀有金属材料与工程,2001(01):15-18. |
| [3] | 李臻熙,曹春晓.Ti-48Al+B合金中硼化物的生长机理[J].稀有金属材料与工程,2001(01):19-22. |
| [4] | 付连峰,林建国,曹国鑫,张永刚,陈昌麒,清华大学,北京.全片层TiAl基合金的屈服强度与显微组织关系[J].稀有金属材料与工程,2001(03):178-182. |
| [5] | 刘秀波,于利根,王华明.γ-TiAl金属间化合物合金激光表面合金化改性[J].稀有金属材料与工程,2001(03):224-227. |
| [6] | 苏勇,张红,陈翌庆.快速凝固Al-4Cr-4Zr-2Ti合金的时效特性[J].稀有金属材料与工程,2001(04):303-305. |
| [7] | 史晶宇,张永刚,高旻,段晓峰.γ-TiAl基合金块状组织中孪晶与反相畴界的相互作用[J].稀有金属材料与工程,2001(05):361-364. |
| [8] | Kawabata T;Izumi O .Dislocation Reactions and Fracture Mechanism of TiAl L10 Type Intermetallic Compound[J].Scripta Metallurgica et Materialia,1987,21(04):435. |
| [9] | Semiation S L;Seetharaman V;Jain V K .Microstructure Development During Conventional and Isothermal Hot Forging of a Near-gamma Titanium Aluminide[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1994,25(12):2753. |
| [10] | Liu Yong;Huang Baiyun;He Yuehui .Microstructures of TiAl based alloys prepared by hot pressing elemental powders[J].Transactions of Nonferrous Metals Society of China,1998(3):397-402. |
| [11] | 陈伶晖;曲选辉 .[J].中国有色金属学报,1996,6(01):121. |
| [12] | 彭超群 .[J].中南工业大学学报(自然科学版),1999,30(01):52. |
| [13] | SENKOV O N;Cavusoglu M;Froes F H .Synthesis and Characterization of a TiAl/Ti5Si3 Composite with a Submicrocrystalline Structure[J].Materials Science and Engineering,2001,A300:85. |
| [14] | Bohn R;Klassen T;Bormann R .Room Temperature Mechanical Behavior of Silicon-doped TiAl Alloys with Grain Sizes in the Nano-and submicro-range[J].Acta Materialia,2001,49:299. |
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