硼纤维-纳米晶镍复合电铸层力学性能的试验研究  

Mechanical property of boron filament-reinforced nanocrystalline Ni composites by electroforming

作　　者：钱王欢[1] 曲宁松[1] 朱增伟[1] 朱荻[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《中南大学学报（自然科学版）》2014年第4期1059-1064,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50975143);江苏省普通高校研究生科研创新计划项目(CXZZ12_0143);新世纪优秀人才支持计划项目(NCET-10-0074)

摘　　要：为了获得更高强度的纤维增强复合电铸层,采用脉冲电流进行电沉积,并在电铸液中加入磺酰亚胺类添加剂,获得硼纤维-纳米晶镍复合电铸层。研究结果表明:在室温下,当硼纤维增强镍复合电铸层晶粒由微米级细化至90 nm时,其显微硬度由219 HV上升至712 HV,抗拉强度由1 018 MPa提高到1 375 MPa。随着电铸层晶粒的进一步细化,由于纤维与基体结合强度的下降,硼纤维-纳米晶镍复合电铸层抗拉强度呈明显下降趋势,但显微硬度依然上升。200℃时,与硼纤维增强微米晶镍复合电铸层相比,纳米晶复合电铸层依然具有很高的强度,但是当温度上升至400℃时,由于晶粒的迅速长大以及界面脆性物质的析出,纳米晶对纤维增强复合电铸层抗拉强度的提升效果已不再显著。The boron filament reinforced electroformed nanocrystalline Ni composites were fabricated, in which pulse current was applied to electroform and sulfonamide type additive was put. Moreover, the effects of the nanocrystalline on the mechanical properties of electroformed composites were examined. The results show that when the grains are refined from micron-scale to 90 nm, the ultimate tensile strength （UTS） increases from 1 018 MPa to 1 375 MPa and the microhardness of electroformed composites increases from 219 HV to 712 HV at room temperature. With the further refinement of the grains, the microhardness of electroformed composites continues to increase. However, the UTS of electroformed composites reduces obviously because the bond strength between the filament and the Ni matrix decrease. Unlike the UTS at room temperature and 200 ℃, the UTS of nanocrystalline electroformed composites has little increase in the range of crystal grains from micron-scale to nano-scale at 400 ℃, because the grains grow up rapidly and brittle substance generates at the interface.

关 键 词：纳米晶 纤维增强 抗拉强度 显微硬度 中温 

分 类 号：TQ153.44[化学工程—电化学工业]