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Ti-22Al-25Nb (at.%)合金O相層片高溫變形動態(tài)球化行為
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太原理工大學 材料科學與工程學院,太原理工大學 材料科學與工程學院,太原理工大學 材料科學與工程學院,太原理工大學 材料科學與工程學院,太原理工大學 材料科學與工程學院

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中圖分類號:

TG146.22

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國家自然科學基金項目（面上項目，重點項目，重大項目）


Dynamic globularization behavior of O-phase lamellae in Ti-22Al-25Nb (at.%) alloy during deformation at elevated temperatures
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College of Materials Science and Engineering, Taiyuan University of Technology,,,,

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    摘要:

    為闡明 Ti2AlNb基合金高溫變形過程中O相層片的球化機制及模型,研究了Ti-22Al-25Nb(at.%)合金在(O+B2)和(α2+O+B2)相區(qū)壓縮變形行為及顯微組織演變規(guī)律。結(jié)果表明,合金的軟化行為與O相層片動態(tài)球化、45°方向剪切變形失穩(wěn)及裂紋萌生有關(guān)。O相層片在較低溫度和較高應變速率下難以球化是由于原子具有較低的擴散速率和較短的擴散時間。O相層片的球化機制主要為層片扭結(jié)和剪斷,本質(zhì)上屬于動態(tài)再結(jié)晶行為。建立了合金高溫變形本構(gòu)關(guān)系,并計算了變形激活能為831 kJ?mol^(-1) ；對O相層片球化的動力學過程進行了研究,其動力學行為受變形條件影響很大,遵循阿夫拉米曲線方程。

    Abstract:

    To clarify the globularization mechanism and model of the O-phase lamellae of Ti2AlNb-based alloys during deformation at elevated temperatures, the hot deformation behavior and microstructure evolution of Ti-22Al-25Nb (at.%) alloy during hot compression deformation in (α2+O+B2) region were investigated. The results showed that the flow softening is relevant to the dynamic globularization of O-phase lamellae and the flow instability including 45° shear deformation, 45° shear cracking and micro-cracks. The deformation constitutive model based on the exponential law was established and the deformation activation energy was calculated to be 831 kJ?mol-1. The globularization of O-phase lamellae is hard to occur at low temperatures or at high strain rates due to slow diffusion rate or insufficient diffusion time. The main globularization mechanism is the kink and shear of the O-phase lamellae, which is confirmed to be a dynamic recrystallization behavior. The dynamic globularization kinetics was also studied, which is sensitive to deformation conditions including deformation temperatures and strain rates and follows an Avrami type sigmoid equation.

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林鵬,唐婷婷,池成忠,張樹志,張長江. Ti-22Al-25Nb (at.%)合金O相層片高溫變形動態(tài)球化行為[J].稀有金屬材料與工程,2018,47(2):416~422.[lin peng, tang tingting, chi chengzhong, zhang shuzhi, zhang changjiang. Dynamic globularization behavior of O-phase lamellae in Ti-22Al-25Nb (at.%) alloy during deformation at elevated temperatures[J]. Rare Metal Materials and Engineering,2018,47(2):416~422.]
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  • 收稿日期:2016-02-29
  • 最后修改日期:2016-09-16
  • 錄用日期:2016-10-18
  • 在線發(fā)布日期: 2018-03-15
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