电沉积微/纳米晶镍板微观表征与冷轧变形微观组织的演化  

Microstructures Characterization of Micro/Nanocrystalline Electrolytic Nickel Plates by Cold Rolling Deformation

作　　者：夏天东[1] 郭龙帮 张涵[1] 乔及森[1] Xia Tiandong;Guo Longbang;Zhang Han;Qiao Jisen(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Materials, Key Laboratory of Non-ferrous MetalAlloys and Processing of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室有色金属合金及加工教育部重点实验室

出　　处：《稀有金属材料与工程》2019年第6期1975-1981,共7页Rare Metal Materials and Engineering

摘　　要：以某公司生产的电沉积镍板为对象,研究了该材料的力学性能;同时为了深入探讨该金属的力学行为特别是塑性变形机制,对其进行了不同程度的冷轧变形,观察了其微观组织的演化。结果表明,该电沉积镍存在宽晶,尺寸为0.5~1.5μm,并有大量生长孪晶;抗拉强度在385~461 MPa之间,在垂直无始极片方向达到了最低值(385 MPa);在水平有始极片方向达到了最高值(461MPa),且断口具有典型的塑性韧窝状形貌,说明试样塑韧性良好。电沉积镍冷轧变形达到90%时,晶粒尺寸明显减小;随着变形程度增加,硬度逐渐增大,出现了加工硬化。轧制过程导致本来取向随机的晶粒在某些晶面和晶向出现择优取向,当轧制变形达到98%时,晶面织构系数TC(220)=76.4%,出现了(220)面的变形织构。The mechanical performances and microstructures of the commercial electrolytic nickel plates were studied. In order to explore the mechanical behavior of metal in the plastic deformation, in particular, several cold rolling with different deformations were imposed on the electrolytic nickel plates. The results show that the micro/nanocrystallines with sizes of 0.5~1.5 μm exist in the electrolytic nickel. At the same time, there are growth twins in the microstructures. The tensile strength of the nickel is from 385 MPa to 461 MPa, and in the vertical direction of the beginning-less product it reaches the lowest(385 MPa), and in parallel direction of the beginning product reaches the highest(461 MPa) and the fracture has a typical plastic dimple fracture morphology, which shows the electrolytic nickel has good plasticity and toughness. For the nickel by cold rolling with 90% deformation, the grain size decreases obviously. The hardness of the metal increases gradually with the increase of deformation, and the work hardening phenomenon exists in nickel metal. The cold rolling process causes the random original grain orientation to prefer to some selected orientations. When the cold rolling deformation reaches 98%, the texture coefficient of crystal face TC(220) is equal to 76.4%, and a deformation texture appears in the(220).

关 键 词：微/纳米镍 力学行为 冷轧 加工硬化 织构 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG339[金属学及工艺—金属材料]