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Influence of Rhenium Content on Vacancy-Type Defect Distribution in Mo–Re Alloys Under Room-Temperature Irradiation.

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Title: Influence of Rhenium Content on Vacancy-Type Defect Distribution in Mo–Re Alloys Under Room-Temperature Irradiation.
Authors: Liu, Yongli1 (AUTHOR), Yang, Qigui2 (AUTHOR), Zhou, Yunpeng2,3 (AUTHOR), Fu, Tong1 (AUTHOR), Chai, Linjiang2,3 (AUTHOR), Cao, Xingzhong2,3 (AUTHOR)
Source: Materials (1996-1944). Jun2026, Vol. 19 Issue 12, p2632. 22p.
Subjects: Molybdenum alloys, Point defects, Irradiation, Nuclear reactor materials, Ion bombardment
Abstract: Mo–Re alloys serve as critical structural components for high-temperature nuclear reactors, and their irradiation degradation is closely related to the evolution of vacancy-type defects. In this study, heavy-ion and He-ion irradiations were performed under RT to introduce an average displacement damage of 3.5 dpa within the 1 μm-thick surface layer of Mo–Re alloys with Re content up to 47 wt.%. PALS, SPB-DBS and CDB techniques were employed to characterize the size, concentration, depth distribution and local chemical environment of irradiation-induced vacancy-type defects. The results demonstrate that the longer lifetime component of irradiated Mo–Re alloys ranged from 262 to 280 ps, corresponding to medium-sized vacancy clusters. The S parameter of all specimens increased significantly from approximately 0.42 to 0.50, with negligible differences (<0.01) among various Mo–Re alloys. No distinct characteristic peak of Re was observed near 17 × 10−3 m0c at the vacancy sites, which was inconsistent with simulation predictions. Mo–Re alloys exhibit similar vacancy-type defect features to pure Mo, implying weak interactions between Re solute atoms and vacancy-type defects under RT irradiation. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Influence of Rhenium Content on Vacancy-Type Defect Distribution in Mo–Re Alloys Under Room-Temperature Irradiation.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Materials+%281996-1944%29%22&quot;&gt;Materials (1996-1944)&lt;/searchLink&gt;. Jun2026, Vol. 19 Issue 12, p2632. 22p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Molybdenum+alloys%22&quot;&gt;Molybdenum alloys&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Point+defects%22&quot;&gt;Point defects&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Irradiation%22&quot;&gt;Irradiation&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Nuclear+reactor+materials%22&quot;&gt;Nuclear reactor materials&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Ion+bombardment%22&quot;&gt;Ion bombardment&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Mo–Re alloys serve as critical structural components for high-temperature nuclear reactors, and their irradiation degradation is closely related to the evolution of vacancy-type defects. In this study, heavy-ion and He-ion irradiations were performed under RT to introduce an average displacement damage of 3.5 dpa within the 1 μm-thick surface layer of Mo–Re alloys with Re content up to 47 wt.%. PALS, SPB-DBS and CDB techniques were employed to characterize the size, concentration, depth distribution and local chemical environment of irradiation-induced vacancy-type defects. The results demonstrate that the longer lifetime component of irradiated Mo–Re alloys ranged from 262 to 280 ps, corresponding to medium-sized vacancy clusters. The S parameter of all specimens increased significantly from approximately 0.42 to 0.50, with negligible differences (&lt;0.01) among various Mo–Re alloys. No distinct characteristic peak of Re was observed near 17 &#215; 10−3 m0c at the vacancy sites, which was inconsistent with simulation predictions. Mo–Re alloys exhibit similar vacancy-type defect features to pure Mo, implying weak interactions between Re solute atoms and vacancy-type defects under RT irradiation. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: &lt;i&gt;Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.3390/ma19122632
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 22
        StartPage: 2632
    Subjects:
      – SubjectFull: Molybdenum alloys
        Type: general
      – SubjectFull: Point defects
        Type: general
      – SubjectFull: Irradiation
        Type: general
      – SubjectFull: Nuclear reactor materials
        Type: general
      – SubjectFull: Ion bombardment
        Type: general
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      – TitleFull: Influence of Rhenium Content on Vacancy-Type Defect Distribution in Mo–Re Alloys Under Room-Temperature Irradiation.
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            NameFull: Liu, Yongli
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            NameFull: Yang, Qigui
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              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 19
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