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β-T51Z合金的熱變形行為與組織演變研究
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重慶大學(xué) 材料科學(xué)與工程學(xué)院

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中圖分類號(hào):

TG146.4+14

基金項(xiàng)目:

國家自然科學(xué)基金資助(項(xiàng)目號(hào)51531005,51571174,51421001),中央高?；究蒲袠I(yè)務(wù)費(fèi)(項(xiàng)目號(hào) 106112017CDJQ138803)


Study on hot deformation behavior and microstructure evolution of β-T51Z alloy
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College of Materials Science and Engineering, Chongqing University

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    摘要:

    針對亞穩(wěn)β-T51Z(51.1Zr-40.2Ti-4.5Al-4.2V)合金,采用Gleeble-3500試驗(yàn)機(jī)進(jìn)行熱模擬實(shí)驗(yàn),利用EBSD和TEM分析了變形溫度和應(yīng)變速率對合金熱變形行為的影響及其組織演變規(guī)律。結(jié)果表明：T51Z合金在熱變形時(shí),其流變應(yīng)力曲線呈現(xiàn)典型的單峰動(dòng)態(tài)再結(jié)晶特征,其應(yīng)力增幅隨著變形溫度的降低或應(yīng)變速率的增加逐漸增加。基于峰值應(yīng)力建立了合金熱變形本構(gòu)方程,計(jì)算得出熱變形激活能為159.57 kJ/mol,該合金在熱壓縮過程中的變形機(jī)制主要與位錯(cuò)的交滑移有關(guān)。變形溫度和應(yīng)變速率對合金形變組織影響較大,整個(gè)熱變形過程都存在動(dòng)態(tài)回復(fù),隨著變形溫度的升高或應(yīng)變速率的降低,合金動(dòng)態(tài)再結(jié)晶分?jǐn)?shù)逐漸增大。在800°C/10 s-1變形條件下,合金容易形成絕熱剪切帶,宏/微觀變形不均勻現(xiàn)象嚴(yán)重。

    Abstract:

    The hot deformation behavior and microstructure evolution of metastable β-T51Z alloy during hot compression deformation was sdudied through EBSD and TEM by thermal simulation compression at Gleeble-3500 thermal-mechanical simulator under different deformed temperatures and strain rates.The results show that the compressing curves in hot deformation have a typical characteristic of single-peak dynamic recrystallization,and the degrees of increased stress increase gradually with decrease of deformed temperatures or increase of strain rates. Based on the peak stress,the constitutive equation of thermal deformation of alloy is established, and the activation energy Q is 159.57 kJ/mol,the deformed mechanism of alloy during hot compression is mainly related to the cross slip of dislocation.The deformed temperature and strain rate have a great influence on the deformation microstructure.Dynamic recovery exists throughout hot deformation process,with increase of deformed temperatures or decrease of strain rates, the fractions of dynamic recrystallization increase gradually. When deformed temperature is 800°C and strain rate is 10 s-1,the adiabatic shear band is easily formed and the macro/micro deformation is not uniform.

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引用本文

毛敏,欒佰峰,李飛濤,廖仲尼,邱日盛.β-T51Z合金的熱變形行為與組織演變研究[J].稀有金屬材料與工程,2020,49(4):1211~1219.[Mao min, Luan baifeng, Li feitao, Liao zhongni, Qiu risheng. Study on hot deformation behavior and microstructure evolution of β-T51Z alloy[J]. Rare Metal Materials and Engineering,2020,49(4):1211~1219.]
DOI：10.12442/j. issn.1002-185X.20181287

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  • 收稿日期:2018-12-25
  • 最后修改日期:2019-02-20
  • 錄用日期:2019-02-22
  • 在線發(fā)布日期: 2020-05-07
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