ISSN: 1002-0071    Imprint: Chinese Materials Research Society
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Yuling Xu,Felix Gensch,Zhen Ren,Karl Ulrich Kainer,Norbert Hort.[J].自然科学进展英文版,2018,28(6):724-730
Effects of Gd solutes on hardness and yield strength of Mg alloys
  
DOI:
中文关键词:  
英文关键词:Mg–Gd alloy Solid solution strengthening Hardness Yield strength
基金项目:
Author NameAffiliation
Yuling Xu MagIC-Magnesium Innovation Center, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany 
Felix Gensch TU Berlin, Forschungszentrum Strangpressen, Gustav-Meyer-Allee 25, 13355 Berlin, Germany 
Zhen Ren China North Material Science and Engineering Technology Group, Linyun Road No. 199, High Technology District, 315103 Ningbo, China 
Karl Ulrich Kainer MagIC-Magnesium Innovation Center, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany 
Norbert Hort MagIC-Magnesium Innovation Center, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany 
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中文摘要:
      
英文摘要:
      Relative contribution of individual strengthening mechanisms to the yield strength of Mg–0–15 wt% Gd alloys were investigated. Alloys with different grain size were prepared by adding Zr and hot extrusion. Hardness and tensile/compression yield strength were tested on the alloys after solid solution treatment and extrusion. Hall- Petch constants were calculated with hardness and tensile/compressive data. The results showed that the hardness of Mg–Gd alloys with similar Gd content and different grain size were almost the same, which indicates that grain size had little effect on hardness. The hardness linearly increased with rising Gd content (dHv/dc ≈25 kgmm?2/at%Gd). The tensile and compressive yield strengths enhanced with the increase of Gd content for all alloys in different conditions. In addition, the tensile/compressive (t/c) yield asymmetry of extruded alloys decreased with increasing Gd content. Large t/c yield asymmetry ratio (1.77) was observed for pure Mg, and with increasing Gd content this value decreased to 1. With the increasing of tensile strength, the stress intensity factor, ky, decreased from 0.27 MPam1/2 for Mg–2 wt% Gd alloy to 0.19 MPam1/2 for Mg–5 wt% Gd alloy, then increased to 0.29 MPam1/2 for Mg–15 wt% Gd alloy. However, ky increased linearly form 0.16–0.31 MPa for compression test. The influence of grain size strengthening was eliminated, and the yield strength of tension and compression both linearly increased with cn, where c is the atom concentration of Gd, and n=1/2 or 2/3.
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