Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloys
The determination of the microstructure and chemical composition of La0.7-xPr xMg0.3Al 0.3Mn0.4Co0.5 Ni3.8 (0 < x < 0.7) metal hydride alloys has been carried out using scanning electron microscopy (SEM), energy dispersive X ray analysis (EDX) and X ray diffraction analysis (XRD). The substitu...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2008-03-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000100004 |
| _version_ | 1811305025190756352 |
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| author | Lia Maria Carlotti Zarpelon Eguiberto Galego Hidetoshi Takiishi Rubens Nunes Faria |
| author_facet | Lia Maria Carlotti Zarpelon Eguiberto Galego Hidetoshi Takiishi Rubens Nunes Faria |
| author_sort | Lia Maria Carlotti Zarpelon |
| collection | DOAJ |
| description | The determination of the microstructure and chemical composition of La0.7-xPr xMg0.3Al 0.3Mn0.4Co0.5 Ni3.8 (0 < x < 0.7) metal hydride alloys has been carried out using scanning electron microscopy (SEM), energy dispersive X ray analysis (EDX) and X ray diffraction analysis (XRD). The substitution of La with Pr changed the grain structure from equiaxial to columnar. The relative atomic ratio of rare earth to (Al, Mn, Co, Ni) in the matrix phase was 1:5 (LaNi5-type structure). Magnesium was detected only in two other phases present. A grey phase revealed 11 at.% Mg and the concentration ratios of other elements indicated the composition to be close to PrMgNi4. A dark phase was very heterogeneous in composition, attributed to the as-cast state of these alloys. The phases identified by XRD analysis in the La0.7Mg0.3Al0.3Mn0.4Co 0.5Ni3.8 alloy were: La(Ni,Co)5, LaAl(Ni,Co)4, La2(Ni,Co)7 and AlMn(Ni,Co)2. Praseodymium favors the formation of a phase with a PuNi3-type structure. Cobalt substituted Ni in the structures and yielded phases of the type: Pr(Ni,Co)5 and Pr(Ni,Co)3. |
| first_indexed | 2024-04-13T08:19:12Z |
| format | Article |
| id | doaj.art-93b46743d34845b2aaceed9bb4c7d905 |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-04-13T08:19:12Z |
| publishDate | 2008-03-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-93b46743d34845b2aaceed9bb4c7d9052022-12-22T02:54:42ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392008-03-01111172110.1590/S1516-14392008000100004Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloysLia Maria Carlotti ZarpelonEguiberto GalegoHidetoshi TakiishiRubens Nunes FariaThe determination of the microstructure and chemical composition of La0.7-xPr xMg0.3Al 0.3Mn0.4Co0.5 Ni3.8 (0 < x < 0.7) metal hydride alloys has been carried out using scanning electron microscopy (SEM), energy dispersive X ray analysis (EDX) and X ray diffraction analysis (XRD). The substitution of La with Pr changed the grain structure from equiaxial to columnar. The relative atomic ratio of rare earth to (Al, Mn, Co, Ni) in the matrix phase was 1:5 (LaNi5-type structure). Magnesium was detected only in two other phases present. A grey phase revealed 11 at.% Mg and the concentration ratios of other elements indicated the composition to be close to PrMgNi4. A dark phase was very heterogeneous in composition, attributed to the as-cast state of these alloys. The phases identified by XRD analysis in the La0.7Mg0.3Al0.3Mn0.4Co 0.5Ni3.8 alloy were: La(Ni,Co)5, LaAl(Ni,Co)4, La2(Ni,Co)7 and AlMn(Ni,Co)2. Praseodymium favors the formation of a phase with a PuNi3-type structure. Cobalt substituted Ni in the structures and yielded phases of the type: Pr(Ni,Co)5 and Pr(Ni,Co)3.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000100004rare earthtransition metalmicroanalysesXRDEDX |
| spellingShingle | Lia Maria Carlotti Zarpelon Eguiberto Galego Hidetoshi Takiishi Rubens Nunes Faria Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloys Materials Research rare earth transition metal microanalyses XRD EDX |
| title | Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloys |
| title_full | Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloys |
| title_fullStr | Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloys |
| title_full_unstemmed | Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloys |
| title_short | Microstructure and composition of rare earth-transition metal-aluminium-magnesium alloys |
| title_sort | microstructure and composition of rare earth transition metal aluminium magnesium alloys |
| topic | rare earth transition metal microanalyses XRD EDX |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000100004 |
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