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随着国防工业和航空工业的不断发展,对耐热铝合金提出了新的更高的要求。目前几种耐热铝合金适应不了国防工业日益发展的需要。因为一般铝合金超过150℃时,强度明显下降。当飞行速度超过两倍音速时,飞机蒙皮表面温度可达200℃以上,在低空飞行时,蒙皮表面温度可按近250℃,现有铝合金则满足不了要求。在Al-Cu-Mg-Fe-Ni系合金中添加0.5％Mn,将对合金的组织和性能产生很大影响。试验表明:加入Mn不仅产生了新的化合物,同时还能控制晶粒尺寸和抑制再结晶,从而提高了合金的高温强度。本文目的是研究Mn对Al-Cu-Mg-Fe-Ni系合金组织和性能的影响,以便确定Mn对提高合金高温性能的确切作用。
With the continuous development of the national defense industry and the aviation industry, new and higher requirements are put forward on the heat resistant aluminum alloy. At present, several heat-resistant aluminum alloy can not meet the needs of the growing defense industry. Because the general aluminum alloy over 150 ℃, the intensity decreased significantly. When the flight speed exceeds two times the speed of sound, the skin surface temperature of the aircraft up to 200 ℃ above, at low altitude, the skin surface temperature can be nearly 250 ℃, the existing aluminum alloy can not meet the requirements. The addition of 0.5% Mn to Al-Cu-Mg-Fe-Ni alloys will have a significant impact on the microstructure and properties of the alloys. Experiments show that adding Mn not only produces new compounds, but also can control grain size and inhibit recrystallization, which improves the high temperature strength of the alloy. The purpose of this paper is to investigate the effect of Mn on the microstructure and properties of Al-Cu-Mg-Fe-Ni alloys in order to determine the exact role of Mn in improving the high-temperature properties of the alloy.