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镍具有面心立方结构,无同素异形转变。冷加工后经完全退火的镍的显微组织和大多数面心立方金属完全再结晶组织一样,具有多边形的晶粒,晶界较平直,晶内有大量退火挛晶。如果存在杂质氧、硫、铅和其他不溶酝镍的元素,即使含量极少也将形成第二相或与镍形成低熔点共晶(如Ni_3S_2与Ni的共晶),分布于晶界,强烈降低塑性和高温性能。
Nickel has a face-centered cubic structure, no allotropic transformation. After cold working, the fully annealed nickel has the same microstructure as most face-centered cubic fully recrystallized grains with polygonal grains with a flat grain boundary and a large number of annealed twin crystals. If impurities of oxygen, sulfur, lead and other elements that do not dissolve nickel are present, a second phase or a low-melting eutectic with nickel (eg, Ni_3S_2 and eutectic Ni) will be formed, Reduce plasticity and high temperature performance.