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Ti3Al基合金的熱變形行為及加工圖
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新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金 (2009Z-06)；江西省自然科學(xué)基金 (2008GZC0041)


Deformation Behavior and Processing Map of Ti3Al Based Alloy during the Isothermal Compression
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    摘要:

    采用THERMECMASTER-Z熱模擬試驗(yàn)機(jī)對(duì)Ti3Al基合金進(jìn)行等溫恒應(yīng)變速率壓縮試驗(yàn)，基于動(dòng)態(tài)材料模型的加工圖技術(shù)研究該合金在950~1350 ℃和0.001~10 s-1范圍內(nèi)的高溫變形特性，并優(yōu)化出其適宜的高溫變形參數(shù)范圍。結(jié)果表明，在應(yīng)變速率較高(≥0.05 s-1)時(shí)，變形多處于失穩(wěn)區(qū)域。在變形溫度為950~1100 ℃，應(yīng)變速率為0.05~10 s-1區(qū)域，發(fā)生了絕熱剪切和局部流動(dòng)現(xiàn)象；在變形溫度為1100~1350 ℃，應(yīng)變速率為0.1~10 s-1區(qū)域發(fā)生了β組織的不均勻變形。在變形溫度為1250~1350 ℃，應(yīng)變速率低于0.01 s-1時(shí)，變形組織粗大，其變形機(jī)制為動(dòng)態(tài)回復(fù)。在變形溫度為1100~1180 ℃，應(yīng)變速率為0.001~0.015 s-1時(shí)，功率耗散效率多大于0.55，變形組織中出現(xiàn)了亞晶；在溫度為970~1010 ℃，應(yīng)變速率為0.001~0.01 s-1時(shí)，功率耗散系數(shù)大于0.5，其變形機(jī)制可能為超塑性成形，這2個(gè)區(qū)域?yàn)門(mén)i3Al基合金適宜的熱變形工藝參數(shù)范圍

    Abstract:

    The isothermal constant strain rate compression tests of a Ti3Al based alloy were conducted by THERMECMASTER-Z simulator and the deformation behavior at the temperature of 950-1350 oC and strain rate of 0.001-10 s-1 were investigated. The processing maps under these deformation conditions were constructed and the hot working parameters were then optimized based on the generated processing maps. The processing maps developed on the basis of dynamic material model exhibit following five domains. (1) The alloy exhibits domain of flow localization and adiabatic shear bands in the temperature range of 950-1100 oC and strain rate range of 0.05-10 s-1. (2) The region of flow instability occurs in the temperature range of 1100-1350 oC and strain rate range of 0.1-10 s-1. The manifestation of flow instability is non-uniform deformation of β grains. (3) The alloy undergoes dynamic recovery in the temperature region of 1250-1350oC and a strain rate below 0.01 s-1. The materials exhibit significant grain coarsening in this domain. (4) The subgrain could be found in the temperature range from 1100 oC to 1180 oC and the strain rate from 0.001 to 0.015 s-1 with a power dissipation efficiency above 0.55. (5) The deformation characteristic of the Ti3Al based alloy in the temperature ranger of 970-1010 oC and strain rate range of 0.001-0.01 s-1 is superplasticity with power dissipation efficiency above 0.5. The last two regions can be considered as the optimal parameter range of isothermal compression for Ti3Al based alloy

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王克魯,魯世強(qiáng),康永林,董顯娟,李 鑫. Ti3Al基合金的熱變形行為及加工圖[J].稀有金屬材料與工程,2011,40(9):1534~1539.[Wang Kelu, Lu Shiqiang, Kang Yonglin, Dong Xianjuan, Li Xin. Deformation Behavior and Processing Map of Ti3Al Based Alloy during the Isothermal Compression[J]. Rare Metal Materials and Engineering,2011,40(9):1534~1539.]
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  • 收稿日期:2010-09-14
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