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均匀化对新型Al-Mg-Mn(Er)合金组织性能的影响 被引量:11

Effect of Homogenization on Microstructures and Properties of New Type Al-Mg-Mn(Er) Alloy
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摘要 采用拉伸性能测试、光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)及能谱分析(EDS)研究了均匀化对低频电磁铸造Al-4.75Mg-0.7Mn-0.1Zr-0.1Ti-0.3Er合金的显微组织和力学性能的影响。在510℃/16h均匀化时,晶界残留相FeMnAl6/MnAl6的数量最少、而晶内弥散相的数量最多,且随后经热轧、冷轧和稳定化退火试样的强度最高;且在冷轧板拉伸变形组织中观察到了大量细小的胞状亚结构、100~500μm的FeMnAl6/MnAl6板条和10~30nm的ErAl3相;FeMnAl6/MnAl6相周围塞积了高密度的位错,ErAl3相易于在位错处析出并可有效地钉扎位错使变形更均匀。 The microstructures and mechanical properties of low-frequency-electromagnetic-cast Al-4.75Mg-0.7Mn-0.1Zr-0.1Ti-0.3Er alloy were investigated by tensile test, OM, SEM, TEM and EDS. When homogenized at 510℃ for 16 h, the amount of residual grain boundary phase FeMnA16/MnA16 is minimum, while the amount of dispersoids in the matrix is maximum, and the sample with the subsequent cold rolling, hot rolling and stabilized annealing has the highest strength. A large amount of dislocation cells, FeMnAl6/MnAl6 rods with size of 100-500 μm and ERA13 particles with size of 10-30 nm precipitates were observed in cold rolled sample homogenized at 510 ℃/16 h after tensile test. ERA13 is easy to precipitate along dislocations. During deformation, high density dislocations are accumulated near FeMnAl6/MnAl6 and fine ERAl3 can effectively pin dislocations, which makes deformation homogeneous.
出处 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2010年第A01期107-112,共6页 Rare Metal Materials and Engineering
基金 "十一五"国家科技支撑计划项目(2007BAE38B01)
关键词 Al-Mg(Er)合金 均匀化 弥散相 性能 Al-Mg (Er) alloy homogenization dispersoids mechanical properties
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