摘要6005A 铝合金具有良好的强度,优异的可塑造型,以及不错的力学性能。目 前已经得到了广泛的应用。本文通过选取挤压态和轧制态的 6005A 铝合金来研 究其力学性能和时效特性。通过拉伸性能测试,显微硬度测试分析了两种铝合金 的力学性能。对轧制态和挤压态的两种铝合金进行了人工时效处理,研究了其时 效硬化行为。利用金相显微镜和扫描电镜来观察轧制态和挤压态的组织。并配合 能谱分析,分析了经过固溶时效处理后轧制态与挤压态的相的组成。得出了以下 的结论:84541
(1)挤压态与挤压态 6005A 铝合金晶粒都呈纤维状分布,平均尺寸大约在 1~5μm 左右。合金当中存在着大量的 Mg2Si 析出强化相,期间弥散大小均匀的 一些第二相晶粒。
(2)轧制态与挤压态铝合金存在着明显的时效硬化特性。轧制态与挤压态 6005A 铝合金在 175℃,12h 的人工时效下可以达到其最高硬度,硬度为 120HV。
(3)经过固溶时效处理后的轧制态 6005A 铝合金抗拉强度,屈服强度以及伸长 率都好于挤压态。
毕业论文关键词:6005A 铝合金 时效特性 力学性能 固溶处理
Abstract 6005A aluminum alloy has good strength, excellent plastic shape, and good mechanical properties。therefore , they have been widely used。 In this paper, the
mechanical properties and aging characteristics of extruded and rolled 6005A aluminum alloy were studied。Mechanical properties of two kinds of aluminum alloy were analyzed by tensile test and micro hardness test。 The two kinds of aluminum
alloys, which are rolled and extruded, were treated by artificial aging, and their
age hardening behavior was studied。 The microstructure of the rolled and extruded states was observed by optical microscope and scanning electron microscope。 Combined with the energy spectrum analysis, the composition of the phase of the
rolling state and the extruding state after the solid solution aging treatment was analyzed。Draw the following conclusions:
(1)The grains of the rolled and extruded 6005A aluminum alloy are all fiber
distribution, the average size is about 50 μm, there are a large number of Mg2Si phase in the alloy, and some second phase grains。
(2)There are obvious age hardening characteristics of rolling state and extruded aluminum alloy。 The rolling state and the extruded 6005A aluminum alloy can reach its highest hardness and the hardness is 120HV,under 175 ℃ and 12 hours。
(3)The tensile strength, yield strength and elongation are better than that of the rolled 6005A aluminum alloy after solid solution aging treatment。
Keywords: 6005A aluminum,aging characteristics,mechanical property,solution treatment
目 录
第一章 绪论 1
1。1 研究背景 1
1。2 高强度铝合金研究现状与应用现状 2
1。2。1 高强度铝合金研究现状 2
1。2。2 高强度铝合金应用现状 2
1。3 铝合金的强化方法 3
1。4 等通道挤压技术 4
1。4。1 等通道挤压技术的基本原理 4
1。4。2 等通道挤压技术的路径 5
1。4。3 等通道挤压的温度 5
1。4。4 等通道挤压的道次