33.3Cr30.6Ni26.1Al5Ti5 (at.%)中熵合金在600℃至800℃的溫度范圍內(nèi)具有優(yōu)異的瞬時拉伸性能。特別是,在700℃條件下出現(xiàn)反常屈服,屈服強度高達為944MPa,拉伸塑性為16%,優(yōu)于大多數(shù)鎳基以及鈷-基高溫合金。通過X射線衍射(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)和三維原子探針(3D-APT)等手段,發(fā)現(xiàn)高體積分?jǐn)?shù)的多主元γ′ [(Ni, Co, Cr)3(Al, Ti)]相的有序強化以及晶界處生成的多主元富(Co, Cr)面心立方相(FCC)結(jié)構(gòu)相引起的晶界強化是該合金在高溫條件下實現(xiàn)強韌化的主要因素。"/>

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富CoCr含量CoCrNiAlTi中熵合金的高溫強韌化行為及微觀機制
作者:
作者單位:

1.沈陽航空航天大學(xué)材料科學(xué)與工程學(xué)院;2.香港城市大學(xué)材料科學(xué)與工程系

作者簡介:

通訊作者:

中圖分類號:

TG139

基金項目:

遼寧省重點研發(fā)計劃軍民融合專題(項目號JH2/10700006)


High-temperature Srengthening and Toughening Behavior and the Associated Deformation Mechanism of CoCrNi-based Medium Entropy Alloy with Rich Co and Cr Content
Author:
Affiliation:

1.School of Materials Science and Engineering,Shenyang Aerospace University;2.Department of Materials Science and Engineering,City University of Hong Kong

Fund Project:

Special topic on military-civilian Integration of key R & D programs in Liaoning Province (Project No. JH2/10700006)

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    摘要:

    本文研究了富CoCr含量的CoCrNi基中熵合金的高溫力學(xué)性能及其變形機制。研究發(fā)現(xiàn),經(jīng)過熱鍛以及時效熱處理,成分為Co33.3Cr30.6Ni26.1Al5Ti5 (at.%)中熵合金在600℃至800℃的溫度范圍內(nèi)具有優(yōu)異的瞬時拉伸性能。特別是,在700℃條件下出現(xiàn)反常屈服,屈服強度高達為944MPa,拉伸塑性為16%,優(yōu)于大多數(shù)鎳基以及鈷-基高溫合金。通過X射線衍射(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)和三維原子探針(3D-APT)等手段,發(fā)現(xiàn)高體積分?jǐn)?shù)的多主元γ′ [(Ni, Co, Cr)3(Al, Ti)]相的有序強化以及晶界處生成的多主元富(Co, Cr)面心立方相(FCC)結(jié)構(gòu)相引起的晶界強化是該合金在高溫條件下實現(xiàn)強韌化的主要因素。

    Abstract:

    In this paper, the high temperature mechanical properties and the associated deformation mechanism of CoCrNi-based entropy alloy with rich-CoCr content were studied. It is found that the alloy with the compostions of Co33.3Cr30.6Ni26.1Al5Ti5 (at. %) exhibited excellent instantaneous tensile properties in the temperature range of 600℃ to 800℃ after hot forging and aging heat treatment. In particular, the yield strength anomaly occurs at 700℃, the tensile yield strength is as high as 944 MPa and the elongation at break is 16%, which is better than most nickel-base and nickel-cobalt-base superalloys. By means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and three-dimensional atomic probe (3D-APT), it is found that the strong ordered strengthening of high-volume fraction multi-principal γ" [(Ni, Co, Cr)3(Al, Ti)] phase combined with grain boundary strengthening aring from the formation of FCC phase with rich-CoCr is the main factor for the excellent high temperature properties of the alloy.

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閆霏,杜興蒿,金城焱,史傳鑫,蓋業(yè)輝,李萬鵬,周子修,黃志青.富CoCr含量CoCrNiAlTi中熵合金的高溫強韌化行為及微觀機制[J].稀有金屬材料與工程,2023,52(1):179~185.[Yan Fei, Du Xinghao, Jin Chengyan, Shi Chuanxin, Gai Yehui, Li Wanpeng, Tzu Hsiu Chou, Huang Chih-Ching. High-temperature Srengthening and Toughening Behavior and the Associated Deformation Mechanism of CoCrNi-based Medium Entropy Alloy with Rich Co and Cr Content[J]. Rare Metal Materials and Engineering,2023,52(1):179~185.]
DOI：10.12442/j. issn.1002-185X.20211041

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  • 收稿日期:2021-11-26
  • 最后修改日期:2022-02-09
  • 錄用日期:2022-03-02
  • 在線發(fā)布日期: 2023-02-13
  • 出版日期: 2023-02-08