4j42 pandi aloyi yachitsulo-nickel yokhazikika, yopangidwa ndi chitsulo (Fe) ndi faifi tambala (Ni), yokhala ndi faifi tambala pafupifupi 41% mpaka 42%. Kuphatikiza apo, ilinso ndi zinthu zazing'ono monga silicon (Si), manganese (Mn), kaboni (C), ndi phosphorous (P). Kapangidwe kake kapadera kameneka kamapereka ntchito yabwino kwambiri.

Kumayambiriro kwa zaka za m'ma 1900, ndi kukwera kwa umisiri wamagetsi, zakuthambo ndi madera ena, zofunikira zapamwamba zinayikidwa patsogolo pa kukula kwa kutentha ndi mphamvu zamakina a zipangizo, ndipo ochita kafukufuku anayamba kufufuza zipangizo za alloy ndi katundu wina. Monga aloyi yachitsulo-nickel-cobalt, kafukufuku ndi chitukuko cha 4J42 yowonjezera alloy ndikukwaniritsa zofunikira za maderawa kuti agwire ntchito. Mwakusintha mosalekeza zomwe zili muzinthu monga faifi tambala, chitsulo, ndi cobalt, pafupifupi mtundu wa 4J42 alloy watsimikiziridwa pang'onopang'ono, ndipo anthu ayambanso kupeza ntchito zoyambira m'magawo ena omwe ali ndi zofunika kwambiri pakuchita zinthu.

Ndi kupita patsogolo kosalekeza kwa sayansi ndi ukadaulo, zofunikira pakugwirira ntchito kwa 4J42 alloy zowonjezera zikuchulukirachulukira. Ofufuza akupitiliza kukonza magwiridwe antchito a 4J42 alloy pokonza njira zopangira ndikuwongolera kapangidwe ka aloyi. Mwachitsanzo, kugwiritsa ntchito ukadaulo wapamwamba kwambiri wosungunula komanso ukadaulo wowongolera wathandizira kuyera ndi kufanana kwa aloyi, ndikuchepetsanso mphamvu ya zinthu zodetsa pakuchita kwa aloyiyo. Nthawi yomweyo, njira yopangira kutentha ndi kuwotcherera kwa 4J42 alloy yaphunziridwanso mozama, ndipo magawo asayansi ndi omveka apangidwa kuti apititse patsogolo magwiridwe antchito ndikugwiritsa ntchito aloyi.

M'zaka zaposachedwapa, ndi chitukuko chofulumira cha zamagetsi, zakuthambo, zachipatala ndi zina, kufunikira kwa alloy yowonjezera 4J42 kukukulirakulirabe, ndipo malo ogwiritsira ntchito akupitilira kukula. Pazinthu zamagetsi, ndikukula kosalekeza kwa mabwalo ophatikizika, zida za semiconductor, ndi zina zambiri, zofunikira pakuyika zida zikuchulukirachulukira. 4J42 alloy yakhala chinthu chofunikira kwambiri pakupanga zida zamagetsi chifukwa cha ntchito yake yabwino yowonjezeretsa kutentha komanso kuwotcherera.

Ndi kupita patsogolo kosalekeza kwa ukadaulo wopanga, chidwi chochulukirapo chidzaperekedwa pakuwongolera chiyero cha aloyi ndikuchepetsa zomwe zili muzinthu zonyansa m'tsogolomu. Izi zithandizira kukhazikika kwa magwiridwe antchito a aloyi, kuchepetsa kusinthasintha kwa magwiridwe antchito chifukwa cha zonyansa, ndikuwongolera kudalirika kwa aloyi pamapulogalamu apamwamba kwambiri. Mwachitsanzo, m'munda wa ma CD amagetsi, chiyero chapamwamba cha 4J42 alloy chingatsimikizire kukhazikika kwanthawi yayitali komanso magwiridwe antchito apamwamba azinthu zamagetsi.