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冷卻方式對(duì)半固態(tài)Ti14合金微觀組織的影響
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重大基礎(chǔ)研究前期研究專項(xiàng)項(xiàng)目(2005CCA06400)和國(guó)家“973”項(xiàng)目（2007CB613807）


Influence of Cooling Models on Microstructure of Semi-Solid Ti14 Alloy
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    摘要:

    采用OM，SEM，XRD研究不同的冷卻方式爐冷（Furnace Cooling，F(xiàn)C）、空冷（Air Cooling，AC）和水淬（Water Quenching，WQ）對(duì)半固態(tài)Ti14合金微觀組織形貌以及相組成的影響。結(jié)果表明：3種冷卻方式均沒(méi)有改變合金的相組成，但影響Ti2Cu相的形態(tài)和分布。爐冷后，Ti2Cu相以顆粒狀按一定位向析出，并排列形成條狀和樹枝狀；空冷后，Ti2Cu相以顆粒狀和層片狀分布于晶內(nèi)和晶界；水淬后，晶界液相特征明顯，晶內(nèi)和晶界無(wú)明顯析出。分析認(rèn)為：半固態(tài)Ti14合金冷卻過(guò)程中經(jīng)歷了包晶凝固，包晶反應(yīng)發(fā)生在液相/β/Ti2Cu三線交點(diǎn)處，使得三線交點(diǎn)處的溶質(zhì)分布很不規(guī)則，包晶相的形核和生長(zhǎng)形態(tài)發(fā)生改變，同時(shí)，冷卻方式不同影響包晶反應(yīng)程度，從而影響后序的共析組織，使得不同冷卻方式冷卻后產(chǎn)生了不同的組織形貌。

    Abstract:

    The microstructure and phase composition of semi-solid Ti14 alloy (α-Ti+Ti2Cu) with different cooling modes (furnace cooling—FC, air cooling—AC and water quenching—WQ) were investigated by OM, SEM and XRD. The results show that the three cooling modes have no effects on the phase composition of Ti14, but influence the morphology and distribution of Ti2Cu. The microstructure of Ti14 after furnace cooling consisted of granular Ti2Cu precipitates, which distributed in a certain direction presenting strip and dentritic structure. After air cooling, Ti2Cu precipitates were granular or lamellar in the grains and grain boundaries; while after water quenching, the microstructure was composed of coarse grain boundary, and no evident precipitates were observed. The semi-solid Ti14 alloy undergoes peritectic solidification during cooling process. The peritectic reaction occurs in the liquid/β/Ti2Cu trijunctions region, which makes the solute distribution there irregular, and the trijunctions dynamics quite complicated. Meanwhile the cooling modes also influence the peritectic reaction extent, and thus affect the following eutectoid, resulting in different microstructure with different cooling modes.

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王 慧,陳永楠,高一帆,魏建鋒,趙永慶,屈可朋.冷卻方式對(duì)半固態(tài)Ti14合金微觀組織的影響[J].稀有金屬材料與工程,2010,39(3):447~451.[Wang Hui, Chen Yongnan, Gao Yifan, Wei Jianfeng, Zhao Yongqing, Qu Kepeng. Influence of Cooling Models on Microstructure of Semi-Solid Ti14 Alloy[J]. Rare Metal Materials and Engineering,2010,39(3):447~451.]
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  • 收稿日期:2009-03-25
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