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金屬鈹靜態(tài)再結晶動力學
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1.北方民族大學 材料科學與工程學院 粉體材料與特種陶瓷省部共建重點實驗室 工業(yè)廢棄物循環(huán)利用及先進材料國際科技合作基地;2.西北稀有金屬材料研究院寧夏有限公司;3.寧夏大學 寧夏光伏材料重點實驗室

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國家自然科學基金資助(51874246);


Static recrystallization kinetics of the metal beryllium
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1.School of Materials Science and Engineering,North Minzu University,Key Laboratory of Powder Material Advanced Ceramics,International Scientific Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials;2.State Key Laboratory for Special Rare Metal Materials,Northwest Rare Metal Materials Research Institute Ningxia Co,Ltd;3.Key Laboratory of NingXia for Photovoltaic materials,Ningxia University

Fund Project:

The National Natural Science Foundation of China

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    摘要:

    利用Instron5582材料試驗機進行等溫壓縮試驗和硬度法測量再結晶百分數(shù),研究金屬鈹不同應變溫度(250 ℃- 450 ℃)、應變速率(10-1 s-1-10-4 s-1)、應變量(16%-92%)壓縮后,在680℃-880℃退火靜態(tài)再結晶組織演化及動力學。結果表明:降低應變溫度提高應變速率可以促進鈹再結晶進行;增加應變量,鈹再結晶晶粒細化,再結晶速率也加快,但應變量增加到60%以上,增加應變量對提高鈹再結晶速率的影響變??;提高退火溫度,鈹再結晶速率明顯加快,特別是退火溫度從750 ℃提高到780 ℃時,鈹再結晶速率急劇增加。880 ℃時,鈹完成再結晶時間僅需約5 min。鈹680 ℃-750 ℃的靜態(tài)再結晶激活能為396.56 kJ/mol,而780 ℃-880 ℃時僅為72.93 kJ/mol。建立具有修正Avirami指數(shù)n的鈹靜態(tài)再結晶動力學模型,模型計算值與實驗值符合較好,能夠較準確預測鈹?shù)蜏匦巫儯?50 ℃-450 ℃)后的靜態(tài)再結晶百分數(shù),滿足工程應用。

    Abstract:

    The microstructure evolution and the kinetics of static recrystallization have been investigated in beryllium during annealing at 680 ℃-880 ℃ through the implementation of the isothermal compression test and the measurement of the recrystallized fraction by hardness. The beryllium was subjected to compression on an Instron 5582 testing machine under varying strain temperatures (250 ℃-450 ℃), strain rates (10-1 s-1 to 10-4 s-1), and true strains (16%-92%). The results show that decreasing the strain temperature and increasing the strain rate promotes the progress of beryllium recrystallization. As the strain is increased, the beryllium recrystallized grains exhibit refinement, and the recrystallization rate is accelerated. However, the effect of increasing the strain on improving the recrystallization rate of beryllium diminished when the strain was increased to more than 60%. Increasing the annealing temperature, the recrystallization rate of beryllium was significantly accelerated. In particular, when the annealing temperature is elevated from 750 ℃ to 780 ℃, the recrystallization rate of beryllium enhances dramatically. At 880 ℃, the time for beryllium to complete recrystallization is reduced to approximately five minutes. The static recrystallization activation energy of beryllium is 396.56 kJ/mol at 680 ℃-750 ℃, while it is only 72.93 kJ/mol at 780 ℃-880 ℃. A static recrystallization kinetic model of beryllium with a modified Avirami component n is constructed. The calculated values of the model are in good agreement with the experimental values, indicating that the model is capable of predicting the static recrystallized fraction of beryllium deformed at low temperatures (250 ℃-450 ℃) and meets the requirements of engineering applications.

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許德美,李美歲,李志年,葉樹鵬,何力軍,李峰.金屬鈹靜態(tài)再結晶動力學[J].稀有金屬材料與工程,,().[Xu Demei, Li Meisui, Li Zhinian, Ye Shupeng, He Lijun, Li Feng. Static recrystallization kinetics of the metal beryllium[J]. Rare Metal Materials and Engineering,,().]
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  • 收稿日期:2024-08-25
  • 最后修改日期:2024-12-12
  • 錄用日期:2025-01-03
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