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W-4Re-0.27HfC合金的1500~1700℃拉伸蠕變性能及損傷機(jī)理
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1.西北工業(yè)大學(xué) 材料學(xué)院 NPU-SAS聯(lián)合中心;2.安泰天龍鎢鉬科技有限公司;3.謝菲爾德大學(xué) 材料科學(xué)與工程學(xué)院,英國 謝菲爾德 S QF

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國家自然科學(xué)基金資助(項目號12102336，U2241239)


Tensile creep properties and damage mechanisms of W-4Re-0.27HfC alloy at 1500~1700 ℃
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1.NPU-SAS Joint Research Center,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an;2.ATTL Advanced Materials Co,Ltd;3.School of Materials Science and Engineering,The University of Sheffield,Sheffield,UK,S QF

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    摘要:

    本文研究了粉末冶金制備的W-4Re-0.27HfC合金的拉伸蠕變行為,測試環(huán)境為真空,蠕變溫度為1500~1700℃,蠕變應(yīng)力為40~60MPa。采用SEM、EBSD和TEM觀察其微觀組織,表征晶粒尺寸和位錯等組織在蠕變過程中的演變規(guī)律。結(jié)果表明,W-4Re-0.27HfC合金的穩(wěn)態(tài)蠕變速率范圍為1′10-7~5′10-6,較純鎢(W)低兩個數(shù)量級。W-4Re-0.27HfC合金抗蠕變性能優(yōu)于純W主要原因是彌散分布的HfC顆粒釘扎位錯和Re取代W原子產(chǎn)生晶格畸變阻礙位錯運(yùn)動,降低位錯遷移率。蠕變溫度為1500℃時,W-4Re-0.27HfC的蠕變機(jī)制以位錯滑移為主,伴隨有晶界滑動。隨著溫度升高,位錯攀移成為主要蠕變機(jī)制。HfC顆粒塞積位錯,導(dǎo)致HfC/基體界面結(jié)合變差,HfC顆粒剝落出現(xiàn)孔洞,合金蠕變性能下降。

    Abstract:

    In this paper, the tensile creep behavior in vacuum of W-4Re-0.27HfC alloy prepared by powder metallurgy was studied. The creep temperature was 1500~1700℃ and the creep stress was 40~60MPa. SEM, EBSD and TEM observations were used to observe the microstructure, characterize the evolution of grain size and dislocation during the creep process. The results show that the steady creep rate of W-4Re-0.27HfC alloy ranges from1′10-7~5′10-6, which is two orders of magnitude lower than that of pure tungsten (W). The creep resistance of W-4Re-0.27HfC alloy is higher than that of pure W due to the dislocation pinned by HfC particles and the lattice distortion caused by Re replacing W atoms. The creep mechanisms of W-4Re-0.27HfC is mainly dislocation slip, accompanied by grain boundary slip at 1500℃. Dislocation climb becomes the main creep mechanism with increasing temperature. The dislocations were blocked by the HfC particles, which leads to the debonding of the HfC/ matrix interface. Moreover, the desquamation of HfC particles forms pores, which results in the great degradation in the creep properties of the alloy.

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王琛瑞,董帝,應(yīng)雯清,張超,王承陽,李玫,孫尚玥,張程煜. W-4Re-0.27HfC合金的1500~1700℃拉伸蠕變性能及損傷機(jī)理[J].稀有金屬材料與工程,2023,52(10):3600~3607.[Wang Chenrui, Dong Di, Ying Wenqing, Zhang Chao, Wang Chengyang, Li Mei, Sun Shangyue, Zhang Chengyu. Tensile creep properties and damage mechanisms of W-4Re-0.27HfC alloy at 1500~1700 ℃[J]. Rare Metal Materials and Engineering,2023,52(10):3600~3607.]
DOI：10.12442/j. issn.1002-185X.20220773

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  • 收稿日期:2022-09-29
  • 最后修改日期:2023-10-09
  • 錄用日期:2022-11-24
  • 在線發(fā)布日期: 2023-10-27
  • 出版日期: 2023-10-24