-1 s-1 ~10-4 s ?1 條件下的真應(yīng)力?應(yīng)變曲線,研究金屬鈹?shù)谝凰苄愿叻鍏^(qū)的流變行為。結(jié)果表明：實(shí)驗(yàn)條件下金屬鈹?shù)牧髯儜?yīng)力隨應(yīng)變速率的增大而增大,隨變形溫度的升高而減小,具有較大的溫度敏感性。各變形條件下,金屬鈹加工硬化到一定程度后,隨著應(yīng)變量的增加,應(yīng)力值有下降趨勢,特別是250 ℃/10-1 s-1的變形條件,出現(xiàn)了明顯的峰值應(yīng)力。并且,隨著應(yīng)變量的增加,金屬鈹?shù)淖冃渭せ钅軓?44.95 kJ/mol 減少至166.82 kJ/mol,這些研究結(jié)果表明金屬鈹在第一塑性高峰區(qū)變形時,軟化機(jī)制受動態(tài)再結(jié)晶的影響,但主要的軟化機(jī)制仍是回復(fù)。建立了包含應(yīng)變量的Arrhenius應(yīng)變補(bǔ)償本構(gòu)方程,預(yù)測相對誤差(MRE)最大為5.0550%,相關(guān)系數(shù)(R)最小為0.9899,能夠較準(zhǔn)確預(yù)測金屬鈹在第一塑性高峰區(qū)壓縮變形時的流變應(yīng)力。"/>

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鈹?shù)谝凰苄愿叻鍏^(qū)的流變行為及本構(gòu)方程
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作者單位:

1.北方民族大學(xué) 材料科學(xué)與工程學(xué)院 粉體材料與特種陶瓷省部共建重點(diǎn)實(shí)驗(yàn)室 工業(yè)廢棄物循環(huán)利用及先進(jìn)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 稀有金屬特種材料國家重點(diǎn)實(shí)驗(yàn)室;3.寧夏大學(xué) 寧夏光伏材料重點(diǎn)實(shí)驗(yàn)室

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基金項(xiàng)目:

國家自然科學(xué)基金資助(51874246)；寧夏自然科學(xué)(2018AAC03225)


Flow behaviors and constitutive equation of the metal berylliumin the first plastic peak zone
Author:
Affiliation:

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 (General Program); The Natural Science Foundation of Ningxia(General Program)

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    摘要:

    利用Instron5582萬能材料試驗(yàn)機(jī)進(jìn)行等溫壓縮試驗(yàn),獲得金屬鈹在變形溫度為250 ℃~450 ℃、應(yīng)變速率為10-1 s-1 ~10-4 s ?1 條件下的真應(yīng)力?應(yīng)變曲線,研究金屬鈹?shù)谝凰苄愿叻鍏^(qū)的流變行為。結(jié)果表明：實(shí)驗(yàn)條件下金屬鈹?shù)牧髯儜?yīng)力隨應(yīng)變速率的增大而增大,隨變形溫度的升高而減小,具有較大的溫度敏感性。各變形條件下,金屬鈹加工硬化到一定程度后,隨著應(yīng)變量的增加,應(yīng)力值有下降趨勢,特別是250 ℃/10-1 s-1的變形條件,出現(xiàn)了明顯的峰值應(yīng)力。并且,隨著應(yīng)變量的增加,金屬鈹?shù)淖冃渭せ钅軓?44.95 kJ/mol 減少至166.82 kJ/mol,這些研究結(jié)果表明金屬鈹在第一塑性高峰區(qū)變形時,軟化機(jī)制受動態(tài)再結(jié)晶的影響,但主要的軟化機(jī)制仍是回復(fù)。建立了包含應(yīng)變量的Arrhenius應(yīng)變補(bǔ)償本構(gòu)方程,預(yù)測相對誤差(MRE)最大為5.0550%,相關(guān)系數(shù)(R)最小為0.9899,能夠較準(zhǔn)確預(yù)測金屬鈹在第一塑性高峰區(qū)壓縮變形時的流變應(yīng)力。

    Abstract:

    The true stress-strain curve of the metal beryllium was obtained under deformation temperature of 250 ℃~450 ℃ and strain rate of 10-1 s-1-10-4 s-1 by the isothermal compression testing which was conducted in the Instron 5582 universal material testing machine, and thus flow behaviors of the metal beryllium was studied in the first plastic peak zone. The results indicate that the flow stress of the metal beryllium increases with the increase of strain rate and decreases with the increase of deformation temperature under the experimental conditions. Furthermore, the flow stress is more sensitive to the variation of temperature. The flow stresses show a decreasing trend with the increase of strain after work hardening to a certain extent under various deformation conditions, especially 250 ℃/10-1 s-1, theSflowSstressShasSaSpeakSvalue. Moreover, the deformation activation energy of the metal beryllium decreases from 244.95 kJ/mol to 166.82 kJ/mol as the strain increases. These results indicate that softening mechanism of the metal beryllium deformed in the first plastic peak zone is influenced by dynamic recrystallization, but the main softening mechanism is still recovery. It was established that an Arrhenius strain compensated constitutive equation that includes strain variables. The equation can accurately predict the flow stress of the metal beryllium during compression deformation in the first plastic peak zone, and the maximum mean relative estimation error (MRE) of the prediction is 5.0550%, and the minimum correlation coefficient (R) is 0.9899.

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許德美,李美歲,李志年,葉樹鵬,何力軍,李峰.鈹?shù)谝凰苄愿叻鍏^(qū)的流變行為及本構(gòu)方程[J].稀有金屬材料與工程,2024,53(12):3413~3421.[Xu Demei, Li Meisui, Li Zhinian, Ye Shupeng, He Lijun, Li Feng. Flow behaviors and constitutive equation of the metal berylliumin the first plastic peak zone[J]. Rare Metal Materials and Engineering,2024,53(12):3413~3421.]
DOI：10.12442/j. issn.1002-185X.20230623

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  • 收稿日期:2023-10-09
  • 最后修改日期:2023-12-13
  • 錄用日期:2024-01-05
  • 在線發(fā)布日期: 2024-12-23
  • 出版日期: 2024-12-16