The results show that the cavity nucleates while the twin-roll-cast AZ31 alloy sheet deforms, and the cavity starts on the tri-grain boundary. The continuously growth and coalescence of the cavities induce the material fracture. The cavities grow directionally and prefer to grow along axis perpendicular to the loading axis.

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Summary: This system imbeds the multi-axis motion controller PMAC card into PC to constitute open numerical control system applied in horizontal twin spindles double column drill press, using the software of the PMAC card, and the software and the hardware resources of PC, this system complete the numerical control function for the horizontal twin spindles double column drill press, and incarnate the open character of the system adequately.

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Dauphine twin：多菲內(nèi)雙晶(曾用名:道芬雙晶)

對稱軸 symmetry axis | 多菲內(nèi)雙晶(曾用名:道芬雙晶) Dauphine twin | 多鍵型晶格 heterodesmic lattice

twinning axis：孿生軸

雙晶軸 twin-axis | 孿生軸 twinning axis | 雙晶面 twin-plane

twin axis; twinning axis：雙晶軸

"twilight-glow","曙暮暉" | "twin axis; twinning axis","雙晶軸" | "twin earthquake","雙生地震"