摘要
采用高能球磨和放电等离子烧结法(SPS)在1000℃制备了NiTi合金,研究了镍含量和烧结压力对NiTi合金致密度、显微组织、显微硬度和摩擦学性能的影响。结果表明:通过高能球磨后,粉末颗粒尺寸减小,随着镍含量增加,Ni相衍射峰向高角度偏移。NiTi合金致密度随着烧结压力增大而增大,在低烧结压力下,合金致密度随着镍含量增加从94.7%降低到84.6%;在高烧结压力下,合金致密度随着镍含量增加表现出先增加后减小的趋势,在镍含量为45%(质量分数,下同)时,合金致密度最低。NiTi合金中主要由NiTi相、NiTi2相和Ni_(3)Ti相组成,Ni_(3)Ti相含量随着镍含量和烧结压力增大而增大,并且镍含量和烧结压力增大会引起Ni_(3)Ti相晶格畸变。随着镍含量从0%增加到65%时,合金显微硬度先增大后减小,在镍含量为50%时,显微硬度最大。在相同化学成分下,合金显微硬度随着烧结压力增大而增大。增大镍含量和烧结压力会降低NiTi合金磨损率,显著提高合金耐磨性。室温下NiTi合金的磨损机制是磨粒磨损和黏着磨损。
In this investigation,NiTi alloys were prepared by high-energy milling and spark plasma sintering(SPS)at 1000℃.The effects of the Ni content and sintering pressure on the relative density,microstructure,microhardness and tribological properties of NiTi alloys were investigated.The experiments show that the particle size of the powders decreases after high-energy ball milling,and the diffraction peak of Ni phase shifts to high angle with the increase of nickel content.The relative density of NiTi alloys is added to the increase in sintering pressure.At low sintering pressure,the relative density of NiTi alloys decreases from 94.7%to 84.6%with the increase of nickel content.While the relative density of NiTi alloys first increases and then decreases as nickel content increase at high sintering pressure.However,the nickel content is 45wt%,the relative density of NiTi alloys is the lowest.NiTi phase,NiTi2 phase and Ni_(3)Ti phase are presented in the microstructures of NiTi alloys.The content of Ni_(3)Ti phase increases with the increase of nickel content and sintering pressure,and the increase of nickel content and sintering pressure will cause lattice distortion of Ni_(3)Ti phase.The microhardness of the alloy first increases and then decreases as the nickel content increases from 0wt%to 65wt%.The microhardness of the NiTi alloy has the biggest value of nickel content of 45wt%.At the same chemical compositions,the microhardness of NiTi alloys increases to the augment of sintering pressure.The wear rate of NiTi alloys reduces as the nickel content and sintering pressure augment and the wear resistance of the alloys is significantly improved.The wear mechanisms of NiTi alloys at room temperature are abrasive wear and adhesive wear.
作者
王伟
程鹏
屈怡珅
辛社伟
邹德宁
王快社
Wang Wei;Cheng Peng;Qu Yishen;Xin Shewei;Zou Dening;Wang Kuaishe(School of Metallurgy Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Xi’an Bright Laser Technologies Co.,Ltd,Xi’an 710075,China;Beijing Jiaotong University,Beijing 100044,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第4期1464-1475,共12页
Rare Metal Materials and Engineering
基金
国家自然科学基金面上项目(51975450)
山西省科技重大专项(20191102006)。
关键词
镍含量
烧结压力
NITI合金
显微组织
摩擦学性能
nickel content
sintering pressure
NiTi alloy
microstructure
tribological properties
作者简介
王伟,男,1985年生,博士,副教授,西安建筑科技大学冶金工程学院,陕西西安710055,E-mail:gackmol@163.com;Corresponding author:Xin Shewei,Ph.D.,Professor,Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an 710016,P.R.China,Tel:0086-29-86231078,E-mail:nwpu_xsw@126.com。
