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激光立體成形Ti2A1Nb基合金組織演化
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國家自然科學(xué)基金重點(diǎn)項目（50131010）；新世紀(jì)優(yōu)秀人才支持計劃項目（NCET-06-0879）；“863”計劃項目（2006AA03Z0449）和“973”計劃項目（2007CB613805）資助


Microstructure Evolution of Ti2AlNb-based Alloy by Laser Solid Forming
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    利用SEM、XRD和TEM研究了激光立體成形（LSF, laser solid forming）Ti2A1Nb基合金的組織演化規(guī)律。結(jié)果表明：激光立體成形Ti2A1Nb基合金沉積態(tài)組織由B2/β0相（ordered-bcc）和O相（orthorhombic）組成。沉積態(tài)的相組成及微觀結(jié)構(gòu)從成形試樣頂部→中部→底部呈現(xiàn)從B2/β0固溶體→B2/β0+O魏氏體→B2/β0固溶體的變化，進(jìn)而使得激光沉積態(tài)Ti2A1Nb基合金中間部位的顯微硬度值最大，頂部與底部相當(dāng)。合金顯微硬度隨激光功率的增大而增大。

    Abstract:

    Microstructure evolution and hardness distribution of as-deposited Ti2A1Nb-based alloy by laser solid forming (LSF) was investigated through SEM, XRD and TEM. The results indicate that the LSFed Ti2A1Nb-based alloy was constituted of B2/β0 phase (ordered-bbc) and O phase (orthorhombic). The as-deposited phase in the bottom and top area of the LSF Ti2A1Nb-based alloy sample is B2 phase (Nb-based solid solution), while the phase in the middle area is O phase Widmanstǎttem. The phase evolution through bottom→middle→top is B2/β0→B2/β0+O→B2/β0. Therefore, the microhardness of the middle area for LSFed as-deposited Ti2AlNb-based alloy is maximum, and that of the top and bottom is similar. The microhardness of the alloys increases with the laser power increasing.

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姜國政,陳 靜,林 鑫,趙曉明,黃衛(wèi)東.激光立體成形Ti2A1Nb基合金組織演化[J].稀有金屬材料與工程,2010,39(3):437~441.[Jiang Guozheng, Chen Jing, Lin Xin, Zhao Xiaoming, Huang Weidong. Microstructure Evolution of Ti2AlNb-based Alloy by Laser Solid Forming[J]. Rare Metal Materials and Engineering,2010,39(3):437~441.]
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  • 收稿日期:2009-04-04
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