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Effect of Temperature on Segregation and Deformation Mechanism of α+Ti2Cu Alloy during Semi-Solid Forging
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Effect of Temperature on Segregation and Deformation Mechanism of α+Ti2Cu Alloy during Semi-Solid Forging
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National Key Basic Research Development Program of China (“973”Program) (2007CB613807); National Natural Science Foundation of China (51201019); the Special Fund for Basic Scientific Research of Central Colleges (2013G3314002)

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    摘要:

    以新型阻燃鈦合金Ti14 (α＋Ti2Cu)為對象，研究了合金在不同溫度半固態(tài)鍛造過程中的偏析和偏聚現(xiàn)象及由此導(dǎo)致的變形機制的變化。結(jié)果表明，半固態(tài)溫度影響液相含量和分布，隨著溫度的升高液相在晶界由不連續(xù)分布轉(zhuǎn)變?yōu)檫B續(xù)分布析出，并最終形成了網(wǎng)狀結(jié)構(gòu)分布。鍛造過程中由于液相和應(yīng)力的共同作用出現(xiàn)了宏觀偏析現(xiàn)象，液相在壓力作用下的流動在晶界處產(chǎn)生了宏觀液相/固相分離現(xiàn)象，靠近試樣中心固相離子集中；這種現(xiàn)象導(dǎo)致了鍛造過程中變形機制的變化，中心區(qū)仍舊是固相粒子的塑性變形為主變形機制，靠近試樣外邊緣主變形機制轉(zhuǎn)變?yōu)楣滔嗔Ｗ拥南鄬?，通過唯象模型對其過程進行討論

    Abstract:

    The segregation behavior and the deformation mechanism of Ti14, a new typical burn resistant α+Ti2Cu alloy were investigated, during semi-solid forging at different temperatures. The results reveal that semi-solid temperature will affect the content and the distribution of liquid phase evidently. Upon increasing of temperature, the liquid phase distribution transforms from discontinuity to continuity at grain boundaries, and finally a type of net-structure is formed. Moreover, the macro-segregation of liquid and solid phases occurs during the semi-solid forging, which leads to a change of the main deformation mechanism from center to edge of the sample. The relationship of macro-segregation of liquid/solid phases and the main deformation mechanism was also discussed by a phenomenological model.

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陳永楠,雒 創(chuàng),張鳳英,魏建鋒,趙永慶. Effect of Temperature on Segregation and Deformation Mechanism of α+Ti2Cu Alloy during Semi-Solid Forging[J].稀有金屬材料與工程,2015,44(6):1369~1373.[Chen Yongnan, Luo Chuang, Zhang Fengying, Wei Jianfeng, Zhao Yongqing. Effect of Temperature on Segregation and Deformation Mechanism of α+Ti2Cu Alloy during Semi-Solid Forging[J]. Rare Metal Materials and Engineering,2015,44(6):1369~1373.]
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  • 收稿日期:2014-06-19
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  • 在線發(fā)布日期: 2016-01-04
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