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研究了电磁搅拌连续铸挤Al-5Ti-1B晶粒细化剂对Al-Zn-Mg-Cu合金铸态组织与力学性能的影响。结果表明:Al-5Ti-1B是Al-Zn-Mg-Cu合金的有效晶粒细化剂,添加质量分数为0.1%的Al-5Ti-1B,可使Al-Zn-Mg-Cu合金铸态组织从粗大的枝晶细化为平均直径为54μm的等轴晶,抗拉强度和伸长率提高5.5%和35.6%;随着Al-5Ti-1B的质量分数从0.1%增加至0.5%,Al-Zn-Mg-Cu合金的晶粒进一步细化,抗拉强度和伸长率继续提高;当Al-5Ti-1B的质量分数为0.5%时,Al-Zn-Mg-Cu合金被细化为平均直径为38μm的等轴晶,合金的抗拉强度和伸长率提高到313 MPa和4.2%,与未添加Al-5Ti-1B相比,分别提高了13.8%和48.2%。
The effect of electromagnetic stirring continuous casting and extruding Al-5Ti-1B grain refiner on the as-cast microstructure and mechanical properties of Al-Zn-Mg-Cu alloy was studied. The results show that Al-5Ti-1B is an effective grain refiner for Al-Zn-Mg-Cu alloy. Adding Al-5Ti-1B with mass fraction of 0.1% Tissue was refined from coarse dendrites to equiaxed grains with an average diameter of 54 μm, the tensile strength and elongation increased by 5.5% and 35.6%, respectively. With the mass fraction of Al-5Ti-1B increasing from 0.1% to 0.5%, Al The grain size of -Zn-Mg-Cu alloy is further refined, and the tensile strength and elongation continue to increase. When the mass fraction of Al-5Ti-1B is 0.5%, the Al-Zn-Mg- Diameter of 38μm equiaxed grains, the tensile strength and elongation of the alloy increased to 313 MPa and 4.2%, respectively, compared with the Al-5Ti-1B without added, respectively, increased by 13.8% and 48.2%.