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利用等通道转角挤压(ECAP)技术,在200℃对Mg-6Zn合金进行了不同道次的挤压。结果表明,经ECAP挤压后合金显微组织明显细化、均匀化,平均晶粒尺寸由15μm减小到3μm;ECAP过程中粗大的块状共晶相变形破碎、细化,并在周围诱发新相析出。通过XRD分析发现析出相主要是Mg_4Zn_7和MgZn_2。经过2道次ECAP挤压后,Mg-6Zn合金的抗拉强度可达275 MPa,屈服强度达到245 MPa,伸长率为24%。当ECAP道次增加到4道次和6道次后,强度反而下降。
Different passes of Mg-6Zn alloy were extruded at 200 ℃ by ECAP. The results show that the microstructure of the alloy is obviously refined and homogenized after ECAP extrusion, and the average grain size decreases from 15μm to 3μm. The coarse massive eutectic phase in ECAP process is crushed, refined and induced in the surroundings New phase precipitation. The XRD analysis showed that the precipitates were mainly Mg_4Zn_7 and MgZn_2. After two passes of ECAP extrusion, the tensile strength of Mg-6Zn alloy reaches 275 MPa, the yield strength reaches 245 MPa and the elongation is 24%. As the number of ECAP passes increased to 4 and 6 passes, the intensity decreased.