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LD7 Aluminium Alloy Superplastic Study

Zhan Zhaolin (School of Mechanical engineering, YPU, Kunming, China, 650051)  
In the paper the superplastic of LD7 aluminium alloy was studied with special pre-tretment.Total elongation as high as 260% can be achieved under the follow condition: 530 ℃ and 2 78×l0 -4 s -1 . The superplastic (δ≥100%)of LD7 aluminium alloy can also be achieved without special pretretment under sone condition. The study proved that temperature is most importain condition for LD7's superplasticity. In high temprature forming process, the grain become axle with re-crystalling process and the presence of particles of second phases leads to the formation of fine and stable grans necessary for achieveing superplasticity.
【CateGory Index】: TG146.21
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