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Abstract：
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The effects related to grain size, deformation velocity for the process of micro-upsetting are investigated. The grain size is increased by recrystallization. The upsetting tests of micro-copper cylinder are performed under the room temperature with different deformation velocity and deforming quantity. The experimental results indicate that the flow of material appears the obvious anisotropy with increasing deforming quantity. There is also a decrease of the yield strength with increasing grain size, the yield stress turns up a obvious fluctuation and the material exhibits the phenomena of hardening and softening. Under the same deforming quantity, the flow stress appears a obvious fluctuation. Deformation velocity has no obvious effect on the flow of material, initial yield stress and flow stress.
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AuthorIntro：
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Reference：
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