热处理条件下变形结构与长周期堆垛结构复合强化镁合金
习 卫, 孙 威*, 韩广达
（北京工业大学固体微结构与性能研究所，北京 100124）
摘要：点冲击变形Mg-Y-Nd-Zn合金中存在高密度孪晶。在400℃热处理过程中，孪晶界附近形成弯折带；孪晶界与弯折带边界向基体发射大量长周期堆垛结构(LPS)。最终在Mg-Y-Nd-Zn合金中实现高密度孪晶、弯折带和LPS的三重复合强化组态。
关键词：变形镁合金；孪晶；弯折带；LPS；复合强化
中图分类号：TG146.2+2；TG166.4；O762；TG115.21+5.3 文献标识码：A doi:10.3969/j.1000-6281.2015-04.007
Composite strengthening states of deformation structure and long period stacking structure in deformed magnesium alloy during heat treatment
XI Wei，SUN Wei*，HAN Guang-da
(Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100024, China)
Abstract:There is a high density twin in Mg-Y-Nd-Zn alloy deformed by instantaneous impact at point. During heat treatment at 400℃, the kink band forms closely at the boundary. And a large number of long period stacking structures (LPS) generate from the boundary of twin and kink band. Finally, the ternary composite strengthening states of twin, kink band and LPS form in deformed Mg alloy.
Keywords:deformed Mg alloy；twin；kink band；LPS；composite strengthening.
全文下载请到同方知网、万方数据或重庆维普等数据库下载！
[1] Dudamell N V，Ulacia I，Ga´lvez F，et al. Twinning and grain subdivision during dynamic deformation of a Mg AZ31 sheet alloy at room temperature [J]. Acta Materialia，2011，59：6949–6962.
[2] Sun H Q，Shi Y N，Zhang M X，et al. Plastic strain-induced grain refinement in the nanometer scale in a Mg alloy [J]. Acta Materialia，2007，55：975-982.
[3] Li Bin，Joshi S P，Almagri O，et al. Rate-dependent hardening due to twinning in an ultrafine-grained magnesium alloy [J]. Acta Materialia，2012，60：1818-1826.
[4] Barnett M R. Twinning and the ductility of magnesium alloys: Part I: “Tension” twins [J]. Materials Science and Engineering A，2007，464：1-7.
[5] MOORE A J W. Twinning and accommodation kinking in zinc [J]. Acta Metallurgica，1955，3：163-169.
[6] REED-HILL R E，ROBERTSON W D. Additional modes of deformation twinning in magnesium [J]. Acta Metallurgica，1957，5：717-727.
[7]Kawamura Y，Hayashi K，Inoue A，et al. Rapidly Solidified powder metallurgy Mg97Zn1Y2 Alloys with excellent tensile yield strength above 600 MPa [J]. Mater Trans JIM，2001，42：1172-1176.
[8]Yamasaki M，Sasaki M，Nishijima M，et al. Formation of 14H long period stacking ordered structure and profuse stacking faults in Mg-Zn-Gd alloys during isothermal aging at high temperature [J]. Acta Mater，2007，55：6798-6805.
[9] Zhu Y M，Weyland M，Morton A J，et al. The building block of long-period structures in Mg-RE-Zn alloys [J]. Scripta Materialia，2009，60：980-983.
[10] Christian J W，Mahajant S. Deformation twinning [J]. Progress in Materials Science，1995，39：1-157.
[11] 韩广达, 孙威, 习卫, 等. Mg-Y-Nd-Zn 镁合金冲击变形结构特征的电子显微研究[J]. 电子显微学报，2014, 33（4）：313-317.
[12] Su C W，Lu L，Lai M O. A Model for the grain refinement mechanism in equal channel angular pressing of Mg alloy from microstructural studies[J]. Materials Science and Engineering A，2006，434：227-236.
[13]Li Li，Zhang X M.Microstructure and texture evolution during high-strain-rate superplastic deformation of coarse-grained Mg-Gd-Y-Zr rolled sheet [J]. Trans Nonferrous Met Soc China，2011，21：1491−1497.
[14] Hirai K，Somekawa H，Takigawa Y，et al. Superplastic forging with dynamic recrystallization of Mg-Al-Zn alloys cast by thixo-molding [J]. Scripta Materialia，2007，56：237-240.
[15] Yamakov V，Wolf D，Phillpot S R，et al. Dislocation–dislocation and dislocation–twin reactions in nanocrystalline Al by molecular dynamics simulation [J]. Acta Materialia，2003，51：4135-4147.
[16] Schiøtz J，Vegge T，Di Tolla F D，et al. Atomic-scale simulations of the mechanical deformation of nanocrystalline metals [J]. Phys Rev B，1999，60：11971.
[17] Xin Y C，Wang M Y，Zeng Z，et al. Strengthening and toughening of magnesium alloy by {10−12} extension twins [J]. Scripta Materialia，2012，66：25-28.
