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的显微组织 Fig.3 Microstructures of AZ31 magnesium alloy sheet before and after ECAR 图4 等径角轧制前和经不同道次轧制后AZ31镁合金板材拉伸名义应力-应变曲线 Fig.4 Tensile nominal stress-strain curves of AZ31 magnesium alloy sheet before and after ECAR 图5 等径角轧制前和不同道次轧制后AZ31镁合金板材的力学性能 Fig.5 Mechanical properties of AZ31 magnesium alloy sheet before and after ECAR 而后随着轧制道次的增加, 又略有降低. 经等径角轧制......
2 μm大空洞的圆度系数和取向角均比较分散,其主要长大机制是塑性变形.关键词:AZ31镁合金；铸轧板材；空洞；扩散；塑性变形 中图分类号:TG 111.91 文献标识码:A Cavity evolution behavior of twin-roll-cast AZ31 alloy sheet during hot deformation... Al,0.854 Zn,0.355 Mn,余量为Mg.图1所示为AZ31镁合金铸轧板材的原 始组织.由图1可知,AZ31镁合金的原始组织主要为细小均匀的退火再结晶晶粒,平均晶粒尺寸约为16.7 μm. 热变形过程中空洞演化行为的原位观察采用带扫描电子显微镜(SEM)的疲劳试验机.该试验机具有在高温环境(室温至800 ℃)用SEM实时观测加载过程中孔洞萌生和长大的功能.原位观察试样平行于轧制方向切......
to 10-2 s-1 at 350 ℃, the grain size gradually decreases, and the twin recrystallizaiton occurs. Key words: AZ31 magnesium alloy; twin-roll cast; dynamic recrystallization 镁为密排六方晶体结构,室温下的c/a值为1.62,只有2个独...试样,其形状与几何尺寸如图1所示. 表1 铸轧AZ31镁合金的化学成分 Table 1 Chemical compositions of twin-roll cast AZ31 magnesium alloy (mass fraction, %) 图1 常温拉伸试样的几何尺寸及形状 Fig. 1 Specimen geometry......
%). It is found that the microstructure of the AZ31 alloy without Sr is mainly composed of the primary α-Mg and β-Mg17Al12 phases which precipitate along interdendritic; the dendritic arm spacing and grain... diffraction (XRD) patterns of AZ31 alloy with different Sr contents (0, 0.3%, 2.5% and 5.0%). It is shown in Fig.4 that without or with the addition of 0.3% Sr in AZ31 magnesium alloy, there are primary α-Mg......
s的组织也更为细小,这跟文献[18]得出的结论相符.可见,室温多向锻压AZ31镁合金的累积应变量越大,孪晶密度越高,退火过程中再结晶越容易发生. 图2 AZ31镁合金在不同累积应变量时经473 K退火不同时间后的显微组织 Fig. 2 Microstructures of AZ31 Mg alloy annealed for different time at 473...高累积应变量试样的粗大,跟初始再结晶晶粒更为相似,所以在退火初期的时候,通过analySIS软件来进行分析的精确度更低,所以导致用这两种方法来评估低累积应变量试样退火过程中的软化行为时差异更大. 图4 AZ31镁合金在累积应变量为1.5时不同退火时间下的定量组织 Fig. 4 Quantitative microstructures of AZ31 Mg alloy......
的工业挤压态棒状AZ31变形镁合金,其成分如表1所列；用线切割数控加工机床从中心部位沿平行于挤压方向切割拉伸试样,尺寸如图1所示. 表1 AZ31的化学成分 Table 1 Chemical composition of AZ31 alloy (mass fraction, %) 图1 片状拉伸试样的形状和尺寸 Fig.1 Shape.... 表3 不同处理状态下AZ31镁合金的力学性能测试结果 Table 3 Mechanical properties results of AZ31 magnesium alloy under different treatment conditions 为了便于分析和讨论实验结果,将经过液氮浸泡10 d的试样1和室温态试样4的力学性能进行对比,结果如图3所示.由图3可以看出......
的各种微观变形机制对应的参数如表1所示. 表1 AZ31镁合金在170 ℃下变形过程中微观变形机制的CRSS及硬化的拟合参数 Table 1 Fitted model parameters describing CRSS and hardening response of micro deformation mechanism of AZ31 Mg alloy..., YANG Xu-yue, ZHANG Lei, ZHANG Zhi-ling. Effect of original orientation on microtexture evolution of AZ31 Mg alloy[J]. Acta Metallurgical Sinica, 2011, 47(2): 140-144. [11] 董 勇, 刘吉兆. 初始取向对大应变轧制AZ31镁合......
) dislocation slip. For as-cast AZ31 Mg alloy, when the deformation temperature was 453 K, lots of serrated twinning and grain boundaries were observed, which means that dynamic recovery (DRV) appeared [14... the relationship between softening effect and deformation mechanisms. 2 Experimental The material used in this study was as-extruded AZ31 Mg alloy with composition as listed in Table 1. The manufacturing......
Microstructure and mechanical properties of AZ31 Mg alloy processed by high ratio extrusion CHEN Yong-jun(陈勇军), WANG Qu-dong(王渠东), LIN Jin-bao(林金宝), ZHANG Lu-jun(张陆军), ZHAI Chun-quan(翟春泉... September 2006 Abstract: The microstructure and mechanical properties of AZ31 Mg alloy processed by high ratio extrusion (HRE) were investigated. General extrusion with extrusion ratio of 7 and high......
为了保证所有的镁合金样品晶体取向保持一致(即是所有的样品具有相同初始条件),采用AZ31挤压态镁合金,成分(质量分数,%)为Al 2.8~3.2,Mn 0.2~1.0,Zn 0.8~1.2, Si不大于0.05,Cu不大于0.05,Ni不大于0.005,Fe不大于0.005,杂质不大于0.3,余量为Mg.沿挤压棒的长度方向在中心截取直径为10 mm,高为12 mm的圆柱体试样,在...文章编号:1004-0609(2013)04-0898-07 Laasraoui-Jonas位错密度模型结合元胞自动机 模拟AZ31镁合金动态再结晶 刘 筱1, 2,朱必武1, 2,李落星1, 2 (1. 湖南大学 汽车车身先进设计制造国家重点实验室,长沙 410082； 2. 湖南大学 机械与运载工程学院,长沙 410082) 摘 ......
