4J42 waa daawaha fidinta birta-nikkel go'an, oo inta badan ka kooban birta (Fe) iyo nikkel (Ni), oo leh maaddo nikkel ah oo ku saabsan 41% ilaa 42%. Intaa waxaa dheer, waxa kale oo ku jira qadar yar oo ah walxaha raadraaca sida silicon (Si), manganese (Mn), carbon (C), iyo fosfooraska (P). Kiimikadan gaarka ah ee kopositi...
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