摘要
以Mg粉、TiC粉为原料,通过高能球磨的方式制备出不同Mg含量(其质量分数分别为0.1%,0.2%,0.3%,0.4%)的TiC(Mg)复合粉末,以该复合粉末(质量分数分别为0.1%,0.2%,0.3%,0.4%)作为细化剂添加至纯铝熔体中,随后通过金属模具进行浇注。采用金相显微镜、显微硬度计、涡流电导仪来研究微量元素Mg的添加对TiC细化效果的影响。结果表明:Mg的添加可提高TiC的细化效果,且随着细化剂TiC(Mg)添加量的增加,Mg的最佳含量逐渐降低,其质量分数分别为0.4%、0.2%和0.1%;当细化剂和Mg的质量分数均为0.2%时,所制备的铝铸锭的晶粒仅为18.3μm,较未添加细化剂和细化剂中未添加Mg所制备的铝铸锭的晶粒尺寸分别降低了43.4%和27.3%,材料的致密度、硬度和电导率均较高,较未添加细化剂时相应参数分别提高18.4%、39.9%和17.9%。同时,Mg的添加使铝锭的抗拉强度由137 MPa提高至158 MPa,提高了15.3%。
Using Mg powder and TiC powder as raw materials,TiC(Mg)powders with different Mg content(mass fraction was 0.1%,0.2%,0.3%,0.4%,respectively)were prepared by high-energy milling and are used as the aluminum refiner.The pure aluminum ingots added different amounts of TiC(Mg)refiner were prepared.The influence of magnesium on grain refinement efficiency of TiC refiner used in aluminum melt had been investigated by metallographic microscope,microhardness tester and eddy current conductivity device.The results show that the addition of Mg in TiC refiner increases its grain refinement efficiency.With the increase of TiC(Mg)amount in pure aluminum,the optimal mass fraction of Mg in TiC(Mg)is gradually reduced to 0.4%,0.2%and 0.1%,respectively.When the mass fraction of the refiner and Mg are both 0.2%,the crystal grain of aluminum ingot obtained is only 18.3μm,which is smaller than that of the aluminum ingot with TiC refiner and without refiner and is increased by 43.4%and 27.3%,respectively.Compared with properties of the sample without refiner,the relative density,microhardness and electrical conductivity is improved by 18.4%、39.9%and 17.9%,respectively.The tensile strength of the aluminum ingots obtained is 158MPa,which is improved by 15.3%compared with that of the sample with TiC refiner.
作者
代卫丽
陈海生
宋月红
刘彦峰
Dai Weili;Chen Haisheng;Song Yuehong;Liu Yanfeng(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,China;Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversionand New Materials,Shangluo University,Shangluo 726000,China)
出处
《甘肃科学学报》
2021年第6期78-85,共8页
Journal of Gansu Sciences
基金
陕西省自然科学基础研究计划资助项目(2019JQ-156)
陕西省教育厅重点科研计划项目(19JS026)
商洛市高性能有色金属制备与加工技术创新团队(SK2019-75)
商洛学院博士科研项目(17SKY019和17SKY018)。
