Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests
This study focuses on the characterization of the failure behavior of an extruded Mg10Dy1Nd alloy during stress corrosion. The microstructure, hardness, strength and corrosion behavior of binary alloys Mg10Dy and Mg1Nd are compared to those of the ternary alloy system. The ternary alloy Mg-Dy-Nd tha...
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MDPI AG
2020-04-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/5/584 |
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| author | Petra Maier Benjamin Clausius Jens Wicke Norbert Hort |
| author_facet | Petra Maier Benjamin Clausius Jens Wicke Norbert Hort |
| author_sort | Petra Maier |
| collection | DOAJ |
| description | This study focuses on the characterization of the failure behavior of an extruded Mg10Dy1Nd alloy during stress corrosion. The microstructure, hardness, strength and corrosion behavior of binary alloys Mg10Dy and Mg1Nd are compared to those of the ternary alloy system. The ternary alloy Mg-Dy-Nd that is not fully recrystallized has the highest hardness but lacks ductility. The investigated alloys twin during plastic deformation. Static C-ring tests in Ringer solution were used to evaluate the stress corrosion properties, and stress corrosion could not be found. None of the alloys failed by fracturing, but corrosion pits formed to various extents. These corrosion pits were elliptical in shape and located below the surface. Some of the pits reduced the remaining wall thickness significantly, but the stress increased by the notch effect did not lead to crack initiation. Furthermore, the C-ring specimen was subjected to compressive loading until fracture. Whereas the Mg1Nd alloy showed ductile behavior, the alloys containing Dy fractured on the tensile side. The crack initiation and growth were mainly influenced by the twin boundaries. The Mg10Dy1Nd alloy had an inhomogeneous microstructure and low ductility, which resulted in a lower fracture toughness than that of the Mg10Dy alloy. There were features that indicate hydrogen-assisted fracture. Although adding Nd decreased the fracture toughness, it reduced the grain size and had a positive influence on the corrosion rate during immersion testing. |
| first_indexed | 2024-03-10T20:09:58Z |
| format | Article |
| id | doaj.art-ed630efc717a431ca577b99240c92a5a |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T20:09:58Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-ed630efc717a431ca577b99240c92a5a2023-11-19T23:03:18ZengMDPI AGMetals2075-47012020-04-0110558410.3390/met10050584Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring TestsPetra Maier0Benjamin Clausius1Jens Wicke2Norbert Hort3School of Mechanical Engineering, University of Applied Sciences Stralsund, 18435 Stralsund, GermanySchool of Mechanical Engineering, University of Applied Sciences Stralsund, 18435 Stralsund, GermanySchool of Mechanical Engineering, University of Applied Sciences Stralsund, 18435 Stralsund, GermanyHelmholtz-Zentrum Geesthacht, Magnesium Innovation Center, 21502 Geesthacht, GermanyThis study focuses on the characterization of the failure behavior of an extruded Mg10Dy1Nd alloy during stress corrosion. The microstructure, hardness, strength and corrosion behavior of binary alloys Mg10Dy and Mg1Nd are compared to those of the ternary alloy system. The ternary alloy Mg-Dy-Nd that is not fully recrystallized has the highest hardness but lacks ductility. The investigated alloys twin during plastic deformation. Static C-ring tests in Ringer solution were used to evaluate the stress corrosion properties, and stress corrosion could not be found. None of the alloys failed by fracturing, but corrosion pits formed to various extents. These corrosion pits were elliptical in shape and located below the surface. Some of the pits reduced the remaining wall thickness significantly, but the stress increased by the notch effect did not lead to crack initiation. Furthermore, the C-ring specimen was subjected to compressive loading until fracture. Whereas the Mg1Nd alloy showed ductile behavior, the alloys containing Dy fractured on the tensile side. The crack initiation and growth were mainly influenced by the twin boundaries. The Mg10Dy1Nd alloy had an inhomogeneous microstructure and low ductility, which resulted in a lower fracture toughness than that of the Mg10Dy alloy. There were features that indicate hydrogen-assisted fracture. Although adding Nd decreased the fracture toughness, it reduced the grain size and had a positive influence on the corrosion rate during immersion testing.https://www.mdpi.com/2075-4701/10/5/584magnesiumMg-Dy-NdC-ring teststress corrosioncorrosion morphology |
| spellingShingle | Petra Maier Benjamin Clausius Jens Wicke Norbert Hort Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests Metals magnesium Mg-Dy-Nd C-ring test stress corrosion corrosion morphology |
| title | Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests |
| title_full | Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests |
| title_fullStr | Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests |
| title_full_unstemmed | Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests |
| title_short | Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests |
| title_sort | characterization of an extruded mg dy nd alloy during stress corrosion with c ring tests |
| topic | magnesium Mg-Dy-Nd C-ring test stress corrosion corrosion morphology |
| url | https://www.mdpi.com/2075-4701/10/5/584 |
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