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在室温下对预先(200±5)℃×3 h退火的Ф8 mm×75 mm的铸态纯镁圆棒试样进行了包套等通道转角挤压(ECAP)试验,研究了挤压道次对组织和力学性能的影响。结果表明:室温4道次ECAP挤压后,试样的晶粒细化到小于6μm;增加挤压道次会使基面织构强度降低;室温ECAP使纯镁的力学性能显著提高,抗拉强度由铸态的33 MPa增加到121 MPa,伸长率则略微下降。
At room temperature, the cast-in-place channel angle squeeze test (ECAP) of Ф8 mm × 75 mm cast pure magnesium rod pre-annealed at (200 ± 5) ℃ for 3 h was carried out. Effect on the organization and mechanical properties. The results show that the grain size of the sample is refined to less than 6μm after 4 passes of ECAP extrusion at room temperature. The increase of extrusion pass decreases the texture strength of the base surface. ECAP at room temperature significantly improves the mechanical properties of pure magnesium, The strength increased from as-cast 33 MPa to 121 MPa, while the elongation decreased slightly.