【作者】 孙金梅；

【导师】 刘炳；

【作者基本信息】 新疆大学 ， 材料加工工程， 2010， 硕士

【摘要】 Al-Mn合金因其密度低、耐蚀、良好的导电导热性能,被广泛地应用于包装材料、感光材料、装饰材料、焊接材料等以及各种需要加工成形和耐蚀性能比纯铝高的场所。目前喷灌等常用过流部件主要采用两种材料:3003和6063两种,本文是根据新疆多风沙的特殊地理环境,在3003的基础上增加锰的含量,研究此种材料的机械性能,为新疆农田节水灌溉管材的应用提供理论依据。目前我国对含Mn量WMn = 1.0%-1.6%之间的二元Al-Mn合金和含Mn10%、Mn20%、Mn30%左右的Al-Mn中间合金做了研究,但对含Mn量在3%-5%较高的Al-Mn合金暂无相关研究。本实验采用搅拌铸造法获得1%-5%不同含锰量的Al-Mn合金试样。然后制出金相组织试样,在线切割机床上加工出标准夏氏V型缺口冲击试样,在车床和铣床加工出标准的棒状拉伸试样。采LED-1430VP型扫描电镜(SEM)观察所获材料的金相组织及断口形貌;JB30A型冲击试验机测试试样的冲击韧性;拉伸试验机测试试样的拉伸性能;HR-150布络维硬度计测试布氏硬度HBS,载荷为62.5kg,压头为直径5㎜淬火钢球。对含Mn量在1%-5%之间Al-Mn合金的金相组织、硬度、冲击性能和对含Mn量在1%-3%之间Al-Mn合金的拉伸性能作了详细分析研究,得出材料的机械性能。用搅拌铸造法成功制备出Al-Mn合金,其实验结果显示:①金相组织:随着含量锰的增加,第二相的形态由细变粗、由长变短、头部由圆变方,而且与基体连接并不紧密,第二相内部有裂纹。②硬度:铸态硬度随着含锰量的增加硬度增加;退火硬度基本不变;人工时效后硬度无明显增加。③冲击性能:随着含锰量的增加,冲击韧性下降。由塑性断裂到脆性断裂,断口有明显的韧窝和河流花样。④拉伸性能:随着锰含量的增加断面收缩率和延伸率下降,抗拉强度先增后减。更多还原

【Abstract】 Al-Mn alloy is widely used in packaging materials, heat exchange materials, photosensitive materials, decoration materials, welding materials and the processing of forming a variety of needs and higher corrosion resistance than pure Al, because of it’s low density, corrosion resistance, good thermal conductivity property.At present, our country just studied on Mn between 1.0 % and 1.6% and Al-10Mn alloy, but with higher content of Mn research less, there is no research between 3% and 5% of Al-Mn alloy. In this study, the way of artificial mixing casting of between 1% and 5% were prepared with different content of Mn of the Al-Mn alloy. And then we get the metallurgical microstructure specimens, standard v from machine tools, tensile samples from the lathe and milling machines, metallurgical organization from LED-1430VP (SEM), the impact of the toughness from JB30A type test;HBS hardness from HR-150, the loading of 62.5kg, pressure head’s diameter is 5㎜。This research studies microstructure, hardness, impact properties with the content of Mn between 1% and 5% of Al-Mn alloy, and tensile properties with the content of Mn between 1% and 3%, the mechanical property of materials is found after studying.Al-Mn alloy is prepared successfully by stirring casting, the experimental results show that:①metallurgical microstructure: the second phase of the shape changes from thin to thick, from long to short, it’s heads vary from round to square as the increase of the content of Mn, but the second phase is not closely connected with the matrix, and also it has a crack.②hardness: cast hardness increases as the content of Mn increases, the annealed hardness is essentially the same, there is no significant increase after artificial aging.③impact property: the impact toughness decreased with the increase of the content of Mn, fracture with obvious dimples and river pattern from the stress fracture to brittle fracture,④tensile property: shrinkage and elongation decreased With the increase of Mn content, tensile strength increased first, and then decreased This article was prepared by artificial stirring casting high content of Mn of Al-Mn alloy, mechanical properties can basically meet the requirements.更多还原