轧制变形量对汽车用7075铝合金组织和力学性能的影响
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摘要
采用OM、TEM、室温拉伸测试研究了热轧变形量对热轧态和热处理态7075铝合金组织和力学性能的影响规律。结果表明:当轧制温度440℃时,随着变形量的增加,7075铝合金组织中动态再结晶越来越完全。变形量超过80%后,试样组织中发生完全动态再结晶。经固溶时效的试样,随着变形量的增加,晶粒尺寸先减小后增大,变形量80%时平均晶粒尺寸最小,达到39μm。试样强度先增加后减小,伸长率逐渐增大。变形量80%时,试样强度达到最大值,抗拉强度和屈服强度分别达到541 MPa和467 MPa。
The effects of hot rolling deformation on the microstructure and mechanical properties of the hot rolled and heat treated 7075 aluminum alloy were studied by using OM, TEM and room temperature tensile test.The results show that when the rolling temperature is 440 ℃, the dynamic recrystallization of 7075 aluminum alloy becomes more and more complete with the increase of deformation. After the deformation is more than 80%, complete dynamic recrystallization occurs in the microstructure of the sample. With the increases of the deformation, the grain size of the sample after solution and aging decreases first and then increases, and the average grain size is the smallest when the deformation is 80%. With the increase of deformation, the grain size decreases first and then increases, and the average grain size is the smallest(39μm) when the deformation is 80%. The strength of the sample increases first and then decreases, and the elongation gradually increases.When the deformation is 80%, the tensile strength and yield strength of the sample reach the maximum, the tensile strength and yield strength reach 541 MPa and 467 MPa, respectively.
The effects of hot rolling deformation on the microstructure and mechanical properties of the hot rolled and heat treated 7075 aluminum alloy were studied by using OM, TEM and room temperature tensile test.The results show that when the rolling temperature is 440 ℃, the dynamic recrystallization of 7075 aluminum alloy becomes more and more complete with the increase of deformation. After the deformation is more than 80%, complete dynamic recrystallization occurs in the microstructure of the sample. With the increases of the deformation, the grain size of the sample after solution and aging decreases first and then increases, and the average grain size is the smallest when the deformation is 80%. With the increase of deformation, the grain size decreases first and then increases, and the average grain size is the smallest(39μm) when the deformation is 80%. The strength of the sample increases first and then decreases, and the elongation gradually increases.When the deformation is 80%, the tensile strength and yield strength of the sample reach the maximum, the tensile strength and yield strength reach 541 MPa and 467 MPa, respectively.
引文
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[4]龚文源,张贵杰,郑小平,等.热轧压下率对7075合金半固态显微组织的影响[J].金属热处理,2017,42(10):189-192.
[5]杨林,陶欣慈,胡斌,等.轧制对Al-6Zn-2Mg-2Cu合金时效组织及Mg Zn2相析出动力学的影响[J].金属热处理,2017,42(1):44-48.
[6]谢金乐.半固态7075铝合金热压缩行为及轧制共研究[D].广州:华南理工大学,2012.
[7]侯陇刚,刘明荔,王新东,等.高强7050铝合金超低温大变形加工与组织、性能调控[J].金属学报,2017,53(9):53-68.
[8]柳香雅.锻压变形量对轻量化机床新型铝合金组织与性能的影响[J].热加工工艺,2017,46(3):146-148.