摘要
采用连续铸造和连续挤压工艺制备了 6201铝合金线材,并采用电子背散射衍射、透射电子显微镜、硬度测量、拉伸实验和电导率测试等方法研究了 Ni微合金化对6201铝合金的显微组织、力学性能和电导率的影响规律.结果表明:Ni微合金化细化了连续铸造、连续挤压和固溶处理状态6201铝合金的晶粒尺寸,进而提高了强度.在时效过程中Ni微合金化加速了 6201铝合金时效硬化行为,在保留塑性前提下提高了峰值硬度和强度,但降低了合金的电导率,其原因是Ni元素主要以固溶体形式存在于合金中,增加了β"析出相的密度并细化了析出相尺寸.通过Ni微合金化及优化热处理工艺获得了较高的屈服强度和抗拉强度,分别为 295.33 MPa 和 326.12 MPa.
Abstract
The continuous casting and continuous extrusion processes were used to prepare 6201 aluminum alloy wires.Electron backscattering diffraction,transmission electron microscopy,hardness,tensile,and conductivity tests were used to study the effects of Ni microalloying on the microstructure,mechanical properties,and conductivity of 6201 aluminum alloy.The results show that Ni microalloying refins the grain size of 6201 aluminum alloy in continuous casting,continuous extrusion and solid solution treatment states,which in turn improved the strength.During the aging process,Ni microalloying accelerated the age-hardening behavior of 6201 aluminum alloy,which increase the peak hardness and strength while retaining plasticity.But it decrease the electrical conductivity of the alloy because the Ni atoms always existed in the form of a solid solution,increasing the density of β"-precipitates and refined the size.The optimum yield and tensile strengths of 295.33 MPa and 326.12 MPa,respectively,are obtained by Ni microalloying and optimization of the heat treatment process.
维普
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