连续变断面循环挤压对AZ31镁合金组织与力学性能的影响
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摘要
采用连续变断面循环挤压技术及新型复合模具对AZ31镁合金进行挤压变形,分析织构演变和循环次数对AZ31镁合金的组织和力学性能的影响。结果表明:AZ31镁合金经过3次循环的变形,上下端平均晶粒尺寸由母材的29.4μm细化到6.1μm,显微硬度提高了18.4 HV,水平方向和轴向的抗拉强度均得到显著提高,轴向的伸长率得提高15.1%,并且宏观织构显示晶粒取向发生了定向转变。
AZ31 magnesium alloy was extruded and deformed with the continuous variable cross-section recycled extrusion and a new type of composite mold. The microstructure and mechanical properties of AZ31 magnesium alloy were investigated with different texture evolution and cycle times. The results show that after 3-cycle extrusion of AZ31 magnesium alloy,the average grain size on the top and bottom sides is refined to 6. 1 μm from 29. 4 μm of the base material,the micro-hardness is raised by 18. 4 HV,the horizontal and axial tensile strength are significantly improved,the axial elongation is increased by 15. 1%,and XRD marco-texture shows directional change of grain orientation.
AZ31 magnesium alloy was extruded and deformed with the continuous variable cross-section recycled extrusion and a new type of composite mold. The microstructure and mechanical properties of AZ31 magnesium alloy were investigated with different texture evolution and cycle times. The results show that after 3-cycle extrusion of AZ31 magnesium alloy,the average grain size on the top and bottom sides is refined to 6. 1 μm from 29. 4 μm of the base material,the micro-hardness is raised by 18. 4 HV,the horizontal and axial tensile strength are significantly improved,the axial elongation is increased by 15. 1%,and XRD marco-texture shows directional change of grain orientation.
引文
[1]玲犀.加强创新,促进镁合金的发展和应用—访中国工程院院士,上海交通大学丁文江教授[J].航空制造技术,2017(12):24-26.
[2]徐晋湘.加速适应新常态筹谋镁业新定位[N].中国有色金属报,2015-12-01(007).
[3]KLOSE C,MROZ G,ANGRISANI G L,et al.Casting process and comparison of the properties of adapted loadsensitive magnesium alloys[J].Production Engineering,2013,7(1):35-41.
[4]BOHLEN J,YI S B,SWIOSTEK J,et al.Microstructure and texture development during hydrostatic extrusion of magnesium alloy AZ31[J].Scripta Materialia,2005,53(2):259-264.
[5]石然然,李名尧,李晓霞,等.镁合金成形性能和加工技术综述[J].铸造技术,2013(7):889-891.
[6]刘长瑞,王快社,王庆娟.连续变断面循环挤压制备细晶材料的方法及装置:中国,1827829[P].2006-09-06.
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[8]李洁,刘莹莹,王庆娟,等.连续变断面循环挤压对TC4合金组织的影响[J].中国有色金属学报,2015(2):344-350.
[9]李洁,刘莹莹,王庆娟,等.连续变断面循环挤压与等通道转角挤压技术的工艺特征及其应用[J].材料导报,2014,(17):64-68.
[10]刘莹莹,刘长瑞,王庆娟,等.工艺参数对连续变断面圆柱体镦粗变形特征的影响[J].材料热处理学报,2014,(12):74-79.
[11]袁战军,马幼平,杨蕾,等.AZ31镁合金连续变断面挤压变形行为及组织演变[J].材料科学与工程学报,2016(3):445-449.
[12]丁茹,刘长瑞,王成,等.连续变断面循环挤压AZ31镁合金的微观组织与力学性能[J].材料科学与工程学报,2009(4):617-619.
[13]刘长瑞,任红霞,王庆娟.连续变断面循环挤压AZ31镁合金的组织与性能[J].轻合金加工技术,2009(7):34-37.
[14]刘莹莹,刘长瑞,杜忠泽,王快社.连续变断面循环挤压用复合模具及其操作方法:中国,104138918A[P].2014-11-12.
[15]HE J J,LIU T M,ZHANG Y,et al.Deformation behaviour of hot extruded Mg alloy AZ31 during compressive deformation[J].Materials Science and Technology,2013,29(2):177-183.
[16]XIN Y,WANG M,ZENG Z,et al.Strengthening and toughening of magnesium alloy by{10 12}extension twins[J].Scripta Materialia,2012,66(1):25-28.
[17]LOU X Y,LI M,BOGER R K,et al.Hardening evolution of AZ31B Mg sheet[J].International Journal of Plasticity,2007,23(1):44-86.
[18]陈振华,许芳艳,傅定发,等.镁合金的动态再结晶[J].化工进展,2006,25(2):140-146.
[19]LIU M C,HUANG J C,FONG Y T,et al.Assessing the interfacial strength of an amorphous–crystalline interface[J].Acta Materialia,2013,61(9):3304-3313.
[20]刘廷光.Fe-Cr-Ni合金的三维晶界网络分布特征及其对应力腐蚀开裂扩展路径影响的研究[D].上海:上海大学,2015.
[2]徐晋湘.加速适应新常态筹谋镁业新定位[N].中国有色金属报,2015-12-01(007).
[3]KLOSE C,MROZ G,ANGRISANI G L,et al.Casting process and comparison of the properties of adapted loadsensitive magnesium alloys[J].Production Engineering,2013,7(1):35-41.
[4]BOHLEN J,YI S B,SWIOSTEK J,et al.Microstructure and texture development during hydrostatic extrusion of magnesium alloy AZ31[J].Scripta Materialia,2005,53(2):259-264.
[5]石然然,李名尧,李晓霞,等.镁合金成形性能和加工技术综述[J].铸造技术,2013(7):889-891.
[6]刘长瑞,王快社,王庆娟.连续变断面循环挤压制备细晶材料的方法及装置:中国,1827829[P].2006-09-06.
[7]刘长瑞,王庆娟,杜忠泽,等.连续变断面循环挤压制备细晶材料的新方法[J].稀有金属材料与工程,2009,(S1):257-260.
[8]李洁,刘莹莹,王庆娟,等.连续变断面循环挤压对TC4合金组织的影响[J].中国有色金属学报,2015(2):344-350.
[9]李洁,刘莹莹,王庆娟,等.连续变断面循环挤压与等通道转角挤压技术的工艺特征及其应用[J].材料导报,2014,(17):64-68.
[10]刘莹莹,刘长瑞,王庆娟,等.工艺参数对连续变断面圆柱体镦粗变形特征的影响[J].材料热处理学报,2014,(12):74-79.
[11]袁战军,马幼平,杨蕾,等.AZ31镁合金连续变断面挤压变形行为及组织演变[J].材料科学与工程学报,2016(3):445-449.
[12]丁茹,刘长瑞,王成,等.连续变断面循环挤压AZ31镁合金的微观组织与力学性能[J].材料科学与工程学报,2009(4):617-619.
[13]刘长瑞,任红霞,王庆娟.连续变断面循环挤压AZ31镁合金的组织与性能[J].轻合金加工技术,2009(7):34-37.
[14]刘莹莹,刘长瑞,杜忠泽,王快社.连续变断面循环挤压用复合模具及其操作方法:中国,104138918A[P].2014-11-12.
[15]HE J J,LIU T M,ZHANG Y,et al.Deformation behaviour of hot extruded Mg alloy AZ31 during compressive deformation[J].Materials Science and Technology,2013,29(2):177-183.
[16]XIN Y,WANG M,ZENG Z,et al.Strengthening and toughening of magnesium alloy by{10 12}extension twins[J].Scripta Materialia,2012,66(1):25-28.
[17]LOU X Y,LI M,BOGER R K,et al.Hardening evolution of AZ31B Mg sheet[J].International Journal of Plasticity,2007,23(1):44-86.
[18]陈振华,许芳艳,傅定发,等.镁合金的动态再结晶[J].化工进展,2006,25(2):140-146.
[19]LIU M C,HUANG J C,FONG Y T,et al.Assessing the interfacial strength of an amorphous–crystalline interface[J].Acta Materialia,2013,61(9):3304-3313.
[20]刘廷光.Fe-Cr-Ni合金的三维晶界网络分布特征及其对应力腐蚀开裂扩展路径影响的研究[D].上海:上海大学,2015.