Microhardness and coercivity measurements on a 2-17-type alloy

The composition studied was (wt.%) Co51.1-Sm23.0-Fe15.9-Cu6.6-Zr3.4. The alloy was solution treated at 1170 deg C for 5 h and quenched in an Ar atmosphere. The samples were subsequently isothermally aged at between 800-900 deg C, inclusively. After each ageing step, the samples were quenched and pul...

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Bibliographic Details
Published in:Journal of materials science letters 1991-02, Vol.10 (4), p.188-189
Main Authors: GENCER, F, HARRIS, I. R
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Hardness
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary:The composition studied was (wt.%) Co51.1-Sm23.0-Fe15.9-Cu6.6-Zr3.4. The alloy was solution treated at 1170 deg C for 5 h and quenched in an Ar atmosphere. The samples were subsequently isothermally aged at between 800-900 deg C, inclusively. After each ageing step, the samples were quenched and pulsed in a magnetic field of 6 T and the demagnetization loops were measured to determine intrinsic coercivity. For the same temperatures, the coercivity peaks occur at longer ageing times than the H sub v peaks. The closely similar peak values of H sub v and iH sub c on ageing at 800, 830 and 850 deg C and the reduced H sub v and iH sub c values at 900 deg C are compared with those of other ageing temperatures. Shoulders in the hardness values and double peaks in the coercivity variations were observed at 800 and 830 deg C, suggesting that there could be a multiple ageing process at these temperatures. Electrical resistivity measurements on the same alloy also showed a similar behaviour at 800 and 830 deg C, where large decreases in the resistivity values were followed by small peaks after long ageing times. A different behaviour was observed at 900 deg C with a higher resistivity after long ageing times. This would be consistent with retention of more Zr in solution. Graphs. 8 ref.--AA
ISSN:0261-8028
1573-4811
DOI:10.1007/BF00723801