摘要
以Mg_(97)Er_(2)Cu_(1)合金为基础,用Ni部分取代Cu,研究了添加Ni对合金组织、力学和耐磨性能的影响。结果表明:当用0.5 at%的Ni取代Cu后,合金中的Mg2Cu相消失,铸态Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)合金的组织主要由18R-LPSO相和α-Mg基体两相组成。添加Ni后,合金中第二相的形貌由不连续网状转变为连续网状分布,其体积分数显著增加。用0.5 at%的Ni取代Cu后,铸态Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)合金的拉伸性能明显提升,其屈服强度和抗拉强度相比Mg_(97)Er_(2)Cu_(1)合金分别提高了27.1%和22.7%。相同载荷下,铸态Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)合金的摩擦系数和磨损率均要低于Mg_(97)Er_(2)Cu_(1)合金,表现出更好的耐磨性能。载荷为60 N时,Mg_(97)Er_(2)Cu_(1)合金磨损机制以剥层磨损为主,而Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)合金磨损机制为磨粒磨损+轻微剥层磨损。
The Cu in Mg_(97)Er_(2)Cu_(1)alloy was partially replaced by Ni in this work,and the effect of Ni on microstructure,mechanical properties and wear resistance of the Mg_(97)Er_(2)Cu_(1)alloy was investigated.The results show that when 0.5 at%Ni is used to replace Cu,the Mg2Cu phase in the alloy disappears,and the microstructure of the as cast Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)alloy mainly consists of 18R-LPSO phase andα-Mg matrix.After the addition of Ni,the morphology of the second phase in the alloy changes from discontinuous network to continuous network distribution,and its volume fraction increases significantly.After substituting 0.5 at%Ni for Cu,the tensile properties of the as cast Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)alloy is significantly improved,and its yield strength and tensile strength are 27.1%and 22.7%higher than that of the Mg_(97)Er_(2)Cu_(1)alloy respectively.Under the same applied load,the friction coefficient and wear rate of the as cast Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)alloy are lower than that of the Mg_(97)Er_(2)Cu_(1)alloy,showing better wear resistance.When the load is 60 N,the wear mechanism of the Mg_(97)Er_(2)Cu_(1)alloy is mainly delamination wear,while that of the Mg_(97)Er_(2)Cu_(0.5)Ni_(0.5)alloy is abrasive wear+slight delamination wear.
作者
周达
杨宇帆
张磊
ZHOU Da;YANG Yu-fan;ZHANG Lei(School of Aeronautical Manufacture Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2023年第3期52-57,共6页
Transactions of Materials and Heat Treatment
基金
江西省自然科学基金资助项目(20181BAB206005)
南昌航空大学大学生创新创业训练计划
第十七届“三小”大学生课外学术科资助技项目。
