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Microscopic Characterization of Semi-Solid Ti14 Alloy
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Microscopic Characterization of Semi-Solid Ti14 Alloy
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National Basic Research Program of China (2005CCA06400);“973”Program (2007CB613807); Special Fund for Basic Scientific Research of Central Colleges, Chan’an Universty (CHD2010JC115)

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    摘要:

    采用熱模擬系統(tǒng)研究半固態(tài)變形參數(shù)對(duì)合金微觀組織演變和元素分布的影響，并討論變形過程中的Ti2Cu析出行為。結(jié)果表明：微觀組織，特別是Ti2Cu析出過程受變形參數(shù)影響較大；溫度的增加，應(yīng)變速率和變形量的降低將促進(jìn)Ti2Cu在晶界的偏析，最終形成了網(wǎng)狀晶界結(jié)構(gòu)。分析認(rèn)為：半固態(tài)晶界的析出過程主要受控于包晶反應(yīng)，升溫或降低其他變形參數(shù)將有利于液相在晶界的析出，形成晶界Cu元素富集區(qū)。液相的偏析和Cu元素的富集增加了該區(qū)域的包晶反應(yīng)，最終在冷卻過程中形成了粗大的網(wǎng)狀晶界結(jié)構(gòu)

    Abstract:

    The microstructural evolution and the element distribution of Ti14 (α+Ti2Cu) alloy during semi-solid compression were investigated. Moreover, the Ti2Cu precipitate behaviors were discussed in detail. The results show that the microstructure, the number and distribution of Ti2Cu precipitates have significant dependence on the process parameters. More Ti2Cu will precipitate on grain boundaries at a higher deformation temperature, and/or a lower strain rate as well as deformation ratio, and finally a network structure is formed after deformation at 1100 °C. The precipitation on grain boundaries is found to be mainly controlled by peritectic reactions. The elevated temperatures resulted in more liquid along the prior grain boundaries, and a Cu-rich region is formed, finally. the “coarse” grain boundaries appear during re-solidification

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陳永楠,魏建鋒,趙永慶,馬雪丹,郝建民. Microscopic Characterization of Semi-Solid Ti14 Alloy[J].稀有金屬材料與工程,2012,41(4):581~584.[Chen Yongnan, Wei Jianfeng, Zhao Yongqing, Ma Xuedan, Hao Jianmin. Microscopic Characterization of Semi-Solid Ti14 Alloy[J]. Rare Metal Materials and Engineering,2012,41(4):581~584.]
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  • 收稿日期:2011-04-08
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