Abnormal structure and properties of copper–silver bar billet by cold casting
Copper alloy rod billet with 20% silver was prepared using homemade three-chamber vacuum cold-type vertical continuous casting equipment. The variation rules of the microhardness, eutectic ratio, and size and distribution of silver particles precipitated in the primary α-Cu phase at the end of the c...
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| Auteurs principaux: | , , , , , , |
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| Format: | article |
| Langue: | EN |
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De Gruyter
2021
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| Accès en ligne: | https://doaj.org/article/bbdbfe628d124c36ad944acb9369d71d |
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| Résumé: | Copper alloy rod billet with 20% silver was prepared using homemade three-chamber vacuum cold-type vertical continuous casting equipment. The variation rules of the microhardness, eutectic ratio, and size and distribution of silver particles precipitated in the primary α-Cu phase at the end of the continuous casting alloy rod blanks were studied using a microhardness tester and scanning electron microscope. The obtained results show that when the cold-type vertical continuous casting speed is 120 mm·min−1, there is obvious reverse segregation of solute element near the end of the prepared ∅7.8 mm copper–silver alloy rod blank. From the end of the continuous casting alloy rod blank to 5 mm from the end, the Cu–Ag eutectic structure in the copper–silver alloy increases from 13.4 to 15.9%, and the size of Ag particles precipitated in the primary α-Cu phase increases from 100 to 350 nm. The microhardness increases from 56 HV0.05 to 85 HV0.05. When the distance from the end exceeds 5 mm, the microstructure and properties of the continuous casting alloy rod blank are basically stable. |
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