摘要
采用固-液复合法制备Fe/ZCuPb20Sn5双金属,系统研究了P对双金属铜层中枝晶细化、元素偏析、第二相析出行为的影响以及铜层摩擦性能。结果表明,P分布于α-Cu与α-(Cu,Sn)两相区间,减弱了Sn元素偏析,析出Cu_(3)P强化相,细化基体组织。铜层的摩擦因数与磨损率均随着P含量的升高逐渐减小,在P含量为0.3%时取得最小值。在磨痕犁沟中Pb包裹着Cu_(3)P相形成自润滑层,提高了材料的摩擦性能。随着P含量的增加,磨损机制由黏着磨损与剥层磨损向磨粒磨损转变。
Fe/ZCuPb20Sn5 bimetal was fabricated by solid-liquid compound method,and effects of P content on den⁃drite refinement,element segregation and precipitation behavior of the second phase in bimetallic copper layer as well as the tribological properties of copper layer were systematically investigated.The results indicate that P is distributed in the interval ofα-Cu andα-(Cu,Sn),which reduces the segregation of Sn elements,leading to the precipitation of Cu_(3)P strengthening phase and refinement of matrix.The friction coefficient and wear rate of copper layer are decreased gradually with increase of P content,reaching the minimum value at 0.3%.In the worn furrows,Pb surrounds Cu_(3)P phase to generate self-lubricating layer,enhancing tribological properties of material.The wear mechanism is trans⁃formed from adhesive wear and peeling wear to abrasive wear with increase of P content.
作者
康圆圆
KANG Yuanyuan(Engineering Training Center,Taiyuan University,Taiyuan 030051)
出处
《特种铸造及有色合金》
CAS
北大核心
2024年第10期1320-1325,共6页
Special Casting & Nonferrous Alloys
基金
山西省高等学校科技创新资助项目(2023L381)。
