激光立体成形Ti_2AlNb基合金组织演化

稀有金属材料与工程, 2010, 39(3): 437-441.

激光立体成形Ti_2AlNb基合金组织演化

姜国政 ^1, , 陈静 ^2, , 林鑫 ^3, , 赵晓明 ^4, , 黄卫东 ^5,

1.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

2.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

3.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

4.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

5.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

基金项目: 国家高技术研究发展计划(863计划)(2006AA03Z0449) 科技部科研项目(2007CB613805) 国家自然科学基金重点项目(50131010) 新世纪优秀人才支持计划(NCET-06-00879)

关键词：激光立体成形(LSF) , Ti_2AlNb基合金 , 组织 , O相

Microstructure Evolution of Ti_2AlNb-based Alloy by Laser Solid Forming

Jiang Guozheng ^1, , Chen Jing ^2, , Lin Xin ^3, , Zhao Xiaoming ^4, , Huang Weidong ^5,

1.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

2.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

3.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

4.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

5.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

Keywords： laser solid forming (LSF) , Ti_2AlNb-based alloy , microstructures , O phase

利用SEM、XRD和TEM研究了激光立体成形(LSF,laser solid forming)Ti_2AlNb基合金的组织演化规律.结果表明:激光立体成形Ti_2AlNb基合金沉积态组织由B2/β_0相(ordered-bcc)和O相(orthorhombic)组成.沉积态的相组成及微观结构从成形试样顶部→中部→底部呈现从B2/β_0固溶体→B2/β_0+O魏氏体 →B2/β_0固溶体的变化,进而使得激光沉积态Ti_2AlNb基合金中间部位的显微硬度值最大,顶部与底部相当.合金显微硬度随激光功率的增大而增大.

Microstructure evolution and hardness distribution of as-deposited Ti2AlNb-based alloy by laser solid forming (LSF) was investigated through SEM,XRD and TEM. The results indicate that the LSFed Ti_2AlNb-based alloy was constituted off B_2/β_0 phase (ordered-bbc) and O phase (orthorhombic). The as-deposited phase in the bottom and top area of the LSF Ti_2AlNb-based alloy sample is B2 phase (Nb-based solid solution),while the phase in the middle area is O phase Widmanstattem. The phase evolution through bottom→ middle→top is B2/β_0→B2/β_0+O→B2/β_0. Therefore,the microhardness of the middle area for LSFed as-deposited Ti_2AlNb-based alloy is maximum,and that of the top and bottom is similar. The microhardness of the alloys increases with the laser power increasing.

参考文献

[1]	Snow D B;Breinan E M;Kear B H.Fourth International Superalloys Symposium[M].USA:ASM,1980:189.
[2]	Phipps Claude.Third International Symposium on Laser Precision Microfabrication[M].Osaka:ISLPM,2003:4830.
[3]	Liu Weiping;Dupont J N .[J].Metallurgical and Materials Transactions,2003,34(11):2633.
[4]	何金江,钟敏霖,刘文今,张红军.激光沉积制备Nb3Al基难熔金属间化合物研究[J].航空材料学报,2006(05):1-5.
[5]	吴波,张翥,沈剑韵,彭德林,柳松清.Ti2AlNb基合金的ISM熔炼研究[J].宇航材料工艺,2002(02):47-50.
[6]	司玉锋,陈子勇,孔凡涛,赵良久,陈玉勇.Ti-22Al-25Nb合金ISM熔炼过程中的成分控制[J].铸造技术,2004(11):834-836.
[7]	Li Shiqiong;Cheng Yunjun;Liang Xiaobo et al.[J].Materials Science Forum,2005,475-479:795.
[8]	YloltonC F;Beckman J P .[J].Materials Science and Engineering,1999,A267:82.
[9]	Tang Feng;Nakazawa Shizuo;Hagiwara Masuo .[J].Materials Science and Engineering,2002,329-331 A:492.
[10]	Jewet T J.[J].Intermetallics,1997(05):157.
[11]	Keith J Leonard;Joseph C Mishurda;Vijay K Vasudevan .[J].Materials Science and Engineering,2002,A329-331:282.
[12]	高士友,张永忠,石力开,王殿武.激光快速成型TC4钛合金的力学性能[J].稀有金属,2004(01):29-33.
[13]	张永刚;韩雅芳;陈国良.金属间化合物结构材料[M].北京:国防工业出版社,2003:794.
[14]	Kumpfert.[J].Advances in Engineering Materials,2003(03):851.
[15]	Griffith M L;Schlienger M E;Harwell L D et al.[J].Materials & Design,1999,20:107.

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