ʻO Zirconium 705 mau mea waiwai
He aha nā mea waiwai o ka zirconium 705 alloy?
ʻO Zirconium kahi haʻahaʻa haʻahaʻa haʻahaʻa neutron absorption cross-section, ikaika kiʻekiʻe a paʻakikī, kūpaʻa maikaʻi loa, a me ka ductility. Hoʻohana nui ʻia ia i nā kula o ka ʻenehana atomic ikehu, aerospace, a me ka biomedicine. He mea koʻikoʻi koʻikoʻi ia, i ʻike ʻia ʻo "The number one metal of the atomic age." E hoʻonui hou i ke kūpaʻa o ka hoʻohana ʻana i nā zirconium alloys a hoʻemi i nā pilikia i ka hana ʻana a me ka hana ʻana, pono ia e hoʻopili i nā mea zirconium alloy. No laila, he mea koʻikoʻi ke aʻo ʻana i ke ʻano a me nā waiwai o nā pilina paʻa pālua ma hope o ka hoʻokumu ʻana ma o ka ʻenehana welding, a ʻo ka diffusion welding he ʻano hoʻohui maʻamau i hiki ke hoʻohana ʻia no ka welding zirconium a me zirconium alloys.
Zr705 zirconium huila ua hoʻohana ʻia e like me ke kumu kumu, ua hoʻohui ʻia ʻo Cu e like me ka papa waena, a ua lawe ʻia ka welding diffusion vacuum ma lalo o nā kūlana like ʻole. Ua aʻo nui ʻia nā hopena o ka mānoanoa Cu intermediate layer a me ka wela welding ma ka microstructure a me nā waiwai mechanical o ka hui welded diffusion. Ua kūkākūkā ʻia nā hui. ʻO ka hana hoʻokumu; Eia kekahi, ua ho'āʻoʻia ke kū'ēʻana o nā hui i loko o nāʻawaʻawaʻawaʻawa ma o nā hoʻokolohua corrosion immersion, a ua aʻoʻia ke kū'ēʻana o ka corrosion o nā hui welded i loaʻa ma lalo o nā mānoanoa papa waena likeʻole a me nā mahana wela. Hōʻike nā hopena:
① Ma hope o ka hoʻohui ʻana i Cu foil e like me ka papa waena, i ka wā o ka mānoanoa Cu foil he 30μm-welded mahana 900> 920 °C a ʻo ka mānoanoa Cu foil he 10μm-weld wela 880, 900, 920 ° C, ua hoʻokumu ʻia ka interface kokoke i ke kumu. metala ʻElua mau hale hoʻonohonoho, ʻo Widmanstatten structure, a me ʻelua-phase structure, ʻo ia paha ke kumu o ka laha ʻana o nā ʻātoma Cu. Ke piʻi ka mahana ma mua o 920 ° C a hiki i 940 a i ʻole 960 ° C, hiki i ka mahana kahi i hoʻololi ʻia ai a->p, a ʻo ka ʻōnaehana kumu kumu holoʻokoʻa ʻo Widmanstatten structure.
② I ka Cu foil mānoanoa he 30μm - kuʻihao wela 900, 920% a me Cu foil mānoanoa 10μm. ʻO ka wela welding 880.900 °C, ua hoʻokumu ʻia kahi ʻāpana o ka hui intermetallic ma ka hui, a hiki i kēia ʻāpana hui ke loaʻa Zr2Cu.Zri4Cu5i> ZrCu> ZrCu5 a me Zr3Cu8 a me Zr7Cuio a me Zr8Cu5 mau pae. Eia kekahi, i ka wā e hoʻohana ai ʻo Cu me ka mānoanoa o 10 μm e like me ka papa waena ma ka mahana like (920 °C), ʻaʻohe hui intermetallic i hoʻokumu ʻia, e hōʻike ana i ka mānoanoa o ka pahu keleawe i kekahi hopena i ka hopena kemika interfacial. I ka hoʻonui ʻana i ke ana wela i 940 °C a me 960 °C. (I ka manawa 2, ʻaʻole i hoʻokumu ʻia kahi papa hoʻohui metala i loko o nā hui kahi i hoʻohui ʻia ai ʻo Cu me ka mānoanoa o 30pm a i ʻole 10 pm ma ke ʻano he papa waena. ʻO ke kumu paha ʻo ka hoʻokē ʻai ʻana o ka wela wili i ka diffusion rate a me ka mamao o Cu atoms i loko o ka matrix Zr, a paʻa nā ʻātoma Cu. Hoʻoheheʻe ʻia i loko o ka matrix Zr, ua hoʻokumu ʻia kahi ʻāpana hoʻonā paʻa Zr-Cu ākea.
③ Ma ka mānoanoa o 30μmCu foil, piʻi mālie ka ikaika tensile me ka piʻi ʻana o ka mahana, a piʻi mua ka elongation a laila emi iho, a laila ʻo 940 °C ka mahana; ma ka mānoanoa o 10μmCu foil, ka nui tensile ikaika a me ka elongation ua ilihune. Hoʻomaikaʻi maikaʻi ʻia nā waiwai mechanical o nā hui me ka ʻole o ka hui intermetallic metala ke 940 °C ka mahana. I ka wa, o ka 'oi loa tensile ikaika a me ka elongation o ka hui i ka mea kiʻekiʻe loa ma waena o nā mānoanoa a pau, a mahuahua mai 576MPa a me 23% ma 30μm i 580MPa a me 32% ma 10μm ( kumu kumu kumu 585MPa a me 44%).
Ka nui o ka corrosion o huila zirconium i loko o ka waiʻakika corrosive wai mea emi ma mua o 0.5% / h. Mai ka hiʻohiʻona o ka micromorphology corrosion, ʻo ke kūpaʻa ʻana i ka ʻino: ʻo ke kumu kumu ma hope o ka weld > wahi weld me ka ʻole o ka papa hoʻohuihui > kumu kumu kumu > ʻāpana hui Weld wahi; mai ka hiʻohiʻona o ka corrosion rate a me ke kaumaha o ke kaumaha, ʻo ka nui o ka corrosion a me ka pohō kaumaha o ke kumu kumu kumu ka mea kiʻekiʻe loa, me ka nui o ka pohō kaumaha a hiki i 44%. E like me ka piʻi ʻana o ka wela welding, e emi ana ka nui o ka corrosion a me ka emi ʻana o ke kaumaha.
