Zr-0.75Sn-0.35Fe-0.15Cr-xNb合金在He<sub><sup>+</sup></sub>輻照下的顯微組織演變及其對腐蝕行為的影響

doi:10.12442/j.issn.1002-185X.20220207

首頁 > 過刊瀏覽>2023年第52卷第4期 >1328-1337. DOI:10.12442/j.issn.1002-185X.20220207

Zr-0.75Sn-0.35Fe-0.15Cr-xNb合金在He+輻照下的顯微組織演變及其對腐蝕行為的影響
DOI:
                        10.12442/j.issn.1002-185X.20220207
                    
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作者單位:1.上海大學(xué)材料研究所;2.中國科學(xué)院上海應(yīng)用物理研究所;3.上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室
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中圖分類號:TL341
基金項(xiàng)目:國家自然科學(xué)基金資助(52001192)；

Microstructural Evolution under He_⁺ Irradiation and its Effect on Corrosion Behavior of Zr-0.75Sn-0.35Fe-0.15Cr-xNb Alloys

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1.Institute of Materials,Shanghai University;2.Shanghai Institute of Applied Physics,Chinese Academy of Sciences

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摘要:

本工作采用2 MeV He_⁺在300 ℃下對Zr-0.75Sn-0.35Fe-0.15Cr-xNb (x=0、1.0,wt%)合金進(jìn)行輻照,然后在360 ℃/18.6 MPa/0.01 M LiOH水溶液中進(jìn)行高壓釜腐蝕實(shí)驗(yàn),利用掃描電子顯微鏡和透射電子顯微鏡研究輻照對合金顯微組織及腐蝕行為的影響。結(jié)果表明,添加Nb改變了Zr-0.75Sn-0.35Fe-0.15Cr合金中第二相的數(shù)量、尺寸和晶體結(jié)構(gòu)。He_⁺輻照1 dpa后,合金的輻照損傷峰區(qū)域分布有大量的He泡和型位錯(cuò)環(huán),添加Nb對He泡和位錯(cuò)環(huán)的數(shù)量及第二相的元素?cái)U(kuò)散等均產(chǎn)生了一定的影響。腐蝕結(jié)果表明,He_⁺輻照或添加1.0 wt%的Nb均可促進(jìn)Zr-0.75Sn-0.35Fe-0.15Cr合金的腐蝕,但當(dāng)二者同時(shí)存在時(shí),輻照能減弱Nb促進(jìn)腐蝕的作用。

Abstract:

Zirconium alloys used as fuel claddings in water-cooled nuclear reactors generally serve in a harsh environment of high-temperature high-pressure water and strong neutron irradiation. Nb is known to play an important role in improving the corrosion resistance of zirconium alloys. Therefore, studying the microstructural changes and its effect on the corrosion behavior of zirconium alloys with different Nb contents before and after irradiation can provide a basis for the design of advanced zirconium alloys. In this work, Zr-0.75Sn-0.35Fe-0.15Cr-xNb (x=0, 1.0, wt%) alloys were prepared and irradiated with 2 MeV He_⁺ at 300 ℃. The effects of irradiation on the microstructure and corrosion behavior of the alloys were investigated by using scanning electron microscope and transmission electron microscope. The corrosion environment was 360℃/18.6 MPa/0.01 M LiOH aqueous solution. The results revealed that the number, average size and crystal structure of the second phase particles in Zr-0.75Sn-0.35Fe-0.15Cr-xNb alloys changed with the increase of Nb content prior to irradiation. After He_⁺ irradiation to 1 dpa, however, a large number of He bubbles and -type dislocation loops were induced in the radiation damage peak region in the alloys. To some extent, addition of Nb can affect the number of He bubbles and dislocation loops and elemental diffusion from the second phase particles. The corrosion results showed that He_⁺ irradiation or addition of 1.0wt% Nb could accelerate the corrosion of Zr-0.75Sn-0.35Fe-0.15Cr alloy, but the irradiation could reduce the acceleration effect of Nb on the corrosion of Zr-0.75Sn-0.35Fe-0.15Cr alloy.

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易麗莎,張興旺,林曉冬,姚美意,胡麗娟,李健健,梁雪,彭劍超,謝耀平,周邦新. Zr-0.75Sn-0.35Fe-0.15Cr-xNb合金在He_⁺輻照下的顯微組織演變及其對腐蝕行為的影響[J].稀有金屬材料與工程,2023,52(4):1328~1337.[Yi Lisha, Zhang Xingwang, Lin Xiaodong, Yao Meiyi, Hu Lijuan, Li Jianjian, Liang Xue, Peng Jianchao, Xie Yaoping, Zhou Bangxin. Microstructural Evolution under He_⁺ Irradiation and its Effect on Corrosion Behavior of Zr-0.75Sn-0.35Fe-0.15Cr-xNb Alloys[J]. Rare Metal Materials and Engineering,2023,52(4):1328~1337.]
DOI：10.12442/j. issn.1002-185X.20220207

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收稿日期:2022-03-15
最后修改日期:2022-05-11
錄用日期:2022-05-23
在線發(fā)布日期: 2023-05-01
出版日期: 2023-04-25

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