利用光学显微镜、扫描电子显微镜、拉伸试验机等研究了二次挤压对一次挤压的Mg-Nd-Zn-Zr生物镁合金显微组织和力学性能的影响.结果表明,在不同挤压条件下经一次挤压的Mg-Nd-Zn-Zr镁合金组织不均匀,由粗大的被拉长晶粒和细小的再结晶晶粒组成；经过二次挤压后,被拉长的晶粒基本消除,晶粒细小均匀.室温力学性能测试结果表明,当一次挤压工艺不是优化工艺时,二次挤压可明显提高合金的强度和伸长率；当一次挤压工艺为优化后的工艺时,二次挤压使合金强度稍有降低,但伸长率大幅提高.一次挤压合金的断裂方式为河流状解理断裂和韧窝状韧性断裂的混合断裂,而二次挤压合金的断裂方式为韧窝状韧性断裂.
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