采用常规挤压和等通道角挤压工艺加工得到高强度Mg97Y2Zn1镁合金.结果表明:常规挤压后,镁合金晶粒尺寸为0.5～2.0 μm,屈服强度、抗拉强度和伸长率分别达到352 MPa、413 MPa和10%.常规挤压后再经过等通道角挤压,晶粒尺寸被进一步细化到300～400 nm,屈服强度和抗拉强度进一步提高到400 MPa和450 MPa.在铸态、常规挤压态和等通道角挤压态的Mg97Y2Zn1合金中,都发现有长周期有序的精细层状结构存在,其产生与基体中溶有少量Y和Zn元素有关.晶粒细化和精细层状结构的存在是材料高强度的原因.
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