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Requirements for achieving high-strain-rate superplasticity in cast aluminium alloys

1998; Taylor & Francis; Volume: 78; Issue: 4 Linguagem: Inglês

10.1080/095008398177896

1362-3036

Patrick B. Berbon, Minoru Furukawa, Zenji Horita, Minoru Nemoto, Nikolai K. Tsenev, Р. З. Валиев, Terence G. Langdon,

Integrated Circuits and Semiconductor Failure Analysis

Equal-channel angular (ECA) pressing has been used to introduce a very small grain size into a commercial cast Al-Mg-Li-Zr alloy. Tensile testing reveals the potential for achieving superplastic ductilities in this alloy at very -high strain rates (greater than 10-2s-1) but experiments show that this potential is realized only if a sufficiently high strain is introduced during the ECA pressing such that the microstructure is homogeneous and consists of an array of grains having large-angle grain boundaries.