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混合元素法激光立體成形Ti-XAl-YV合金的微觀組織演化
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國家自然科學(xué)基金 (50871089)；中國博士后科學(xué)基金 (20100470040)；西北工業(yè)大學(xué)凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室博士后基金(06-BZ-2010)；西北工業(yè)大學(xué)凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室開放課題 (SKLSP201102)


Microstructure Evolution of Laser Solid Formed Ti-XAl-YV Alloys from Blended Elemental Powders
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    摘要:

    研究了混合元素法激光多層沉積Ti-XAl-YV (X≤11，Y≤10)（質(zhì)量分?jǐn)?shù)，%，下同）合金的微觀組織隨Al、V元素含量的演化規(guī)律。結(jié)果發(fā)現(xiàn)：隨Al、V含量的增加，Ti-XAl-YV合金原始b晶內(nèi)a域的尺寸和數(shù)量逐漸減小，原始b晶內(nèi)的顯微組織逐漸由魏氏組織轉(zhuǎn)化為a和b編織細(xì)密的網(wǎng)籃組織，且a板條的尺寸和長寬比顯著減小。結(jié)合單道多層激光沉積過程熱歷史循環(huán)曲線的計(jì)算、合金相變點(diǎn)溫度的計(jì)算以及Ti-XAl-YV合金的相圖分析，研究了單道多層激光沉積Ti-XAl-YV合金a相的形核和生長條件，揭示了微觀相結(jié)構(gòu)演化機(jī)理。

    Abstract:

    The microstructure evolution of laser multi-layer deposited Ti-XAl-YV (X￡11, Y￡10, mass fraction, %, similarly hereinafter) alloys from blended elemental powders with the content of Al and V was studied. Results show that the size and quantity of a colony in the prior b grains are decreased gradually with the increase of Al and V, and the microstructure in prior b grains changes from widmanst?tten structure to basketweave structure with the a laths and b phase braided. Meanwhile, the size and aspect ratio of a laths are decreased obviously. The nucleation and growth conditions of a phase in single-line laser multi-layer deposited Ti-XAl-YV alloys were analyzed and the microstructure evolution mechanism was revealed on the basis of thermal history modeling, a→b transformation temperature computation and the phase diagram analysis of Ti-XAl-YV alloys.

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譚 華,張鳳英,陳 靜,林 鑫,徐粉紅,黃衛(wèi)東.混合元素法激光立體成形Ti-XAl-YV合金的微觀組織演化[J].稀有金屬材料與工程,2011,40(8):1372~1376.[Tan Hua, Zhang Fengying, Chen Jing, Lin Xin, Xu Fenhong, Huang Weidong. Microstructure Evolution of Laser Solid Formed Ti-XAl-YV Alloys from Blended Elemental Powders[J]. Rare Metal Materials and Engineering,2011,40(8):1372~1376.]
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  • 收稿日期:2010-12-30
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