采用熔炼法制备出新型Ni Cu C固体自润滑材料,研究了稀土镁球化剂对Ni Cu C合金中石墨的球化作用。结果表明:在加入铜量0～50%范围内,用0.75%的稀土镁球化剂可以使结晶的石墨有效球化;石墨经球化处理后,形核密度提高,分布均匀;铜的固溶...采用熔炼法制备出新型Ni Cu C固体自润滑材料,研究了稀土镁球化剂对Ni Cu C合金中石墨的球化作用。结果表明:在加入铜量0～50%范围内,用0.75%的稀土镁球化剂可以使结晶的石墨有效球化;石墨经球化处理后,形核密度提高,分布均匀;铜的固溶作用提高了合金基体的硬度,增大了材料的电阻率,在加入量大的情况下,对石墨有一定的球化作用,但降低石墨的含量;Ni Cu C合金的自润滑性能随石墨含量的提高及球化而得到改善;与退火态45#钢和GCr15轴承钢进行干摩擦磨损时,Ni 20%Cu 3.5%C合金的摩擦因数分别保持在0.12和0.13。展开更多
A novel process for manufacturing A1-0.70Fe-0.24Cu alloy conductor was proposed, which includes horizontal continuous casting and subsequent continuous extrusion forming （Conform）. The mechanical properties, electri...A novel process for manufacturing A1-0.70Fe-0.24Cu alloy conductor was proposed, which includes horizontal continuous casting and subsequent continuous extrusion forming （Conform）. The mechanical properties, electrical conductivity and the compressed creep behaviour of the alloy were studied. The results indicate that the Conform process induces obvious grain refinement, strain-induced precipitation of AI7CuzFe phase and the transformation of crystal orientation distribution. The processed alloy has good comprehensive mechanical properties and electrical conductivity. Moreover, a better creep resistance under the conditions of 90 ~C and 76 MPa is shown compared with pure A1 and annealed copper, and the relationship between primary creep strain and time may comply with the logarithmic law. The enhanced properties are attributed to the grain refinement as well as the fine and homogeneously distributed thermally stable A1Fe and A17Cu2Fe precipitation phases.展开更多
文摘采用熔炼法制备出新型Ni Cu C固体自润滑材料,研究了稀土镁球化剂对Ni Cu C合金中石墨的球化作用。结果表明:在加入铜量0～50%范围内,用0.75%的稀土镁球化剂可以使结晶的石墨有效球化;石墨经球化处理后,形核密度提高,分布均匀;铜的固溶作用提高了合金基体的硬度,增大了材料的电阻率,在加入量大的情况下,对石墨有一定的球化作用,但降低石墨的含量;Ni Cu C合金的自润滑性能随石墨含量的提高及球化而得到改善;与退火态45#钢和GCr15轴承钢进行干摩擦磨损时,Ni 20%Cu 3.5%C合金的摩擦因数分别保持在0.12和0.13。
基金Project(20130161110007) supported by the Doctoral Program of Higher Education of China
文摘A novel process for manufacturing A1-0.70Fe-0.24Cu alloy conductor was proposed, which includes horizontal continuous casting and subsequent continuous extrusion forming （Conform）. The mechanical properties, electrical conductivity and the compressed creep behaviour of the alloy were studied. The results indicate that the Conform process induces obvious grain refinement, strain-induced precipitation of AI7CuzFe phase and the transformation of crystal orientation distribution. The processed alloy has good comprehensive mechanical properties and electrical conductivity. Moreover, a better creep resistance under the conditions of 90 ~C and 76 MPa is shown compared with pure A1 and annealed copper, and the relationship between primary creep strain and time may comply with the logarithmic law. The enhanced properties are attributed to the grain refinement as well as the fine and homogeneously distributed thermally stable A1Fe and A17Cu2Fe precipitation phases.
