挤压道次对航空用工业纯铝ECAP组织和性能的影响
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摘要
采用等通道转角挤压(ECAP)方法加工航空用工业纯铝以形成细晶结构,对其组织、力学性能以及腐蚀性能进行了测试,研究挤压道次对工业纯铝组织和性能的影响。结果表明:ECAP加工后工业纯铝试样基体晶粒变长并细化。随挤压道次(7道次前)增加,其拉伸强度与表面硬度上升,伸长率降低。经过ECAP加工后,试样腐蚀电位提高,点蚀电位正移,耐蚀性能得到改善。工业纯铝试样ECAP后表面属于点蚀类型,并随挤压道次增加,腐蚀区的数量逐渐降低。
The industrial pure aluminum for aviation was processed by using equal channel angular extrusion (ECAP)method to form fine crystal microstructure. The microstructure, mechanical properties and corrosion resistance were tested.The effect of extrusion pass on the microstructure and properties of industrial pure aluminum was studied. The results show that after ECAP processing, the matrix grains of the industrial pure aluminum samples become longer and finer. The tensile strength and surface hardness increase and the elongation decreases with the increase of extrusion pass (before 7 passes).After ECAP processing, the corrosion potential of the sample increases, the pitting potential shifts positively and the corrosion resistance is improved. After ECAP, there are more corrosion zones on the surface of industrial pure aluminum samples, the surface belongs to pitting corrosion type, and the number of corrosion zones decreases gradually with the increase of extrusion pass.
The industrial pure aluminum for aviation was processed by using equal channel angular extrusion (ECAP)method to form fine crystal microstructure. The microstructure, mechanical properties and corrosion resistance were tested.The effect of extrusion pass on the microstructure and properties of industrial pure aluminum was studied. The results show that after ECAP processing, the matrix grains of the industrial pure aluminum samples become longer and finer. The tensile strength and surface hardness increase and the elongation decreases with the increase of extrusion pass (before 7 passes).After ECAP processing, the corrosion potential of the sample increases, the pitting potential shifts positively and the corrosion resistance is improved. After ECAP, there are more corrosion zones on the surface of industrial pure aluminum samples, the surface belongs to pitting corrosion type, and the number of corrosion zones decreases gradually with the increase of extrusion pass.
引文
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[5]高雷雷,张金中,沙磊,等.通道转角挤压过程中工艺参数对摩擦应力的影响及模具优化[J].热加工工艺,2016,45(21):108-113.
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