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首页> 外文会议>2006 BIMW >Effect of Cryogenic Treatment on Mechanical Properties and Microstructures of 3102 Al-alloy
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Effect of Cryogenic Treatment on Mechanical Properties and Microstructures of 3102 Al-alloy

机译：深冷处理对3102铝合金力学性能和组织的影响

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The mechanical properties and microstructures of different state cryogenic treatment 3102 Al-foil, such as H19, H26 or O state, were studied by tensile testing, optical metalloscopy (OM) and transmission electron microscope(TEM). The results showed that, after deep cryogenic treatment, the strength of H19 state increased and the elongation to failure decreased. In the same time, the yield strength increased and breaking strength decreases and the elongation decreased dramatically for O state, but, for H26 state, the strength and elongation increased dramatically, which correspond to the properties of this state at low temperatures. OM and TEM observation showed cryogenic treatment caused by the fibrous grains broken down and many grains with the size of 0.1～3μm These fine equiaxial grains can improve the strength and elongation of the Al-foil. On the contrary, the atomic shrinkage force slips high density dislocations into interface of the grains and forms terraces and fissure in it. That leads to the elongation decrease and the interface been broaden at very low temperature. The grain size of O state with cryogenic treatment is larger than without cryogenic treatment. As a result, the synthetic mechanical properties of H26 state improved by the way of cryogenic treatment, but the H19 state and O state should avoid use and put at low temperatures.
机译：通过拉伸试验，光学金相学（OM）和透射电子显微镜（TEM）研究了不同状态的低温处理3102铝箔（如H19，H26或O状态）的力学性能和显微组织。结果表明，经过深冷处理后，H19状态的强度增加，断裂伸长率降低。同时，O状态的屈服强度增加，断裂强度降低，伸长率显着下降，但是对于H26状态，强度和伸长率显着增加，这与低温下该状态的性质相对应。 OM和TEM观察表明，由于纤维状细颗粒的破裂和许多晶粒尺寸在0.1〜3μm引起的低温处理，这些细的等轴晶粒可以提高铝箔的强度和伸长率。相反，原子收缩力将高密度的位错滑入晶粒的界面，并在其中形成台阶和裂缝。这导致伸长率降低，并且在非常低的温度下界面变宽。经过低温处理的O态晶粒尺寸大于未经低温处理的O态晶粒尺寸。结果，通过低温处理提高了H26状态的合成机械性能，但是应避免使用H19状态和O状态并且将其置于低温下。

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