摘要在航天航空军事等领域内,时效强化处理铝合金凭借在韧性,强度等诸多方面所表现出来的良好的力学性能而受到了广泛的使用。我们知道Al-Cu合金在经过间歇时效处理后,可以用拉伸试验测量其力学性能。在本次实验过程中,我们采用硬度测试和拉伸试验研究不同时效状态下2519A 铝合金的力学性能。根据得出的硬度曲线和真应力-真应变曲线表明:随着冷轧变形量从 7%增加至 50%,合金的硬度先升高再降低。当冷轧变形量为 15%时,在冷轧态合金组织中观察到密度不均匀的位错组织,在峰时效状态合金组织中观察到不均匀分布的 θ′相。不均匀分布的 θ′相可能是造成合金时效硬化能力降低和激活能升高的原因。最终本次实验旨在研究T9I6间歇时效热处理能否使2519A铝合金的力学性能得到改善。结果证明,当时效温度为165℃,冷轧变形量为18%-30%,时效时间为4h时,2519A铝合金的力学性能最优。87803
毕业论文关键词 铝合金 间歇时效 力学性能
毕业设计说明书外文摘要
Title Interrupted aging system of Al-Cu alloy with an Influence of yield strength and Elongation
Abstract In the aerospace and military fields, aging strengthening treatment of aluminum in many aspects of toughness and strength demonstrated with the good mechanical properties has been widely used。 We know Al-Cu alloy after an intermittent aging treatment, tensile test can be used to measure its mechanical properties。 In this experiment, we used hardness test and tensile test to investigate the mechanical properties of aluminum alloy 2519A in different aging states。 According to the hardness curve and true stress - true strain curve show: With the cold rolling deformation rate increases from 7% to 50%, the hardness increased first and then reduced。 When the cold rolling deformation rate is 15%, we observed uneven density of dislocations organization in cold rolled alloy structure, uneven distribution of θ 'phase in peak-aged alloy。 Uneven distribution of θ 'phase may be the cause of aging hardening ability reduced of alloy and activation energy Increased。 The final study was to investigate whether the intermittent aging treatment with T9I6 can improve the mechanical properties of 2519A aluminum alloy。 The result shows that when the aging temperature is165℃, cold rolling deformation rate is 18%-30%, aging time is 4h, the mechanical properties of 2519A aluminum alloy is optimal。
Keywords Aluminum Alloy Intermittent aging Mechanical property
目 录
1 引言 1
1。1 铝合金 1
1。2 铝合金的分类 1
1。2。1 铸造铝合金的分类 1
1。2。2 变形铝合金的分类 1
1。3 铝合金的特点 2
1。3。1 铝合金的优点 2
1。3。2 铝合金的缺点 2
1。4 铝合金的应用 2
1。5 2000系铝合金 3
1。6 间歇时效的起源 3
1。7 间歇时效强化的工艺原理 3
1。8 间歇时效强化的影响因素 4
1。9 间歇时效强化的应用 4
1。10 研究的目的和意义