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本文对硬状态LF6铝合金板材的超塑性进行了研究。发现这种状态的合金,不需专门的预处理,就可呈现出很显著的超塑效应,其延伸率可达463％。力学特性和金相研究结果表明,LF6铝合金由于第二相粒子的作用,可以获得细小、稳定的晶粒,因而其超塑效应十分显著。此合金超塑变形的主要机制是晶界滑移,起调节作用的机制主要是品内滑移。本文的研究工作可使某些合金超塑成形的预处理工作结合在原材料生产过程中进行,从而可以简化超塑成形的工艺过程,扩大这种新工艺的应用范围。
In this paper, the superplasticity of LF6 aluminum alloy sheet is studied. Found that state of the alloy, without special pretreatment, you can show a very significant super-plastic effect, the elongation of up to 463%. The mechanical properties and metallographic results show that the superplastic effect of LF6 aluminum alloy is very remarkable due to the fine and stable grains obtained by the action of the second phase particles. The main mechanism of this alloy superplastic deformation is grain boundary slip, the main mechanism for regulating the role of slip within the product. The research work in this paper can make some alloy superplastic forming pretreatment combined with the raw material production process, which can simplify the superplastic forming process, expanding the scope of application of this new process.