环缝式电磁搅拌对7075铝合金热处理的影响

研究了无电磁搅拌、普通电磁搅拌和环缝式电磁搅拌等不同制备方法对7075铝合金均匀化热处理时间的影响。结果表明,相比于无电磁搅拌和普通电磁搅拌,环缝式电磁搅拌工艺制备的7075铝合金的凝固组织更加均匀细小。同时通过观察不同制备方法得到的7075铝合金均匀化热处理后的显微组织变化规律,发现环缝式电磁搅拌工艺制备的7075铝合金均匀化热处理的时间明显缩短。均匀化热处理后合金硬度和电导率的变化亦证明了这点。     

磁场热处理对新型铝合金性能的影响

对铸态Al-Mg-Si-Fe-RE新型铝合金试样分别进行了常规均匀化热处理和磁场均匀化热处理,并测试分析了试样低温力学性能和耐磨损性能。结果表明:磁场均匀化热处理较常规均匀化热处理更有利于提高试样的耐磨损性能和低温力学性能。与常规均匀化热处理相比,磁场均匀化热处理试样的抗拉强度、屈服强度、伸长率和冲击吸收功分别增大了59 MPa、52 MPa、8.4%、14.4 J,-40℃和25℃磨损体积分别减小了55.3%、56.8%。试样的均匀化热处理工艺优选为磁场热处理。     

热处理对低频电磁铸造2024铝合金力学性能的影响

通过试验研究了均匀化热处理和人工时效处理对普通DC铸造和低频电磁铸造2024铝合金力学性能的影响。结果表明,随均匀化时间延长,两种试样均呈抗拉强度降低、伸长率增加的趋势。低频电磁铸锭伸长率的变化幅度大于普通DC铸锭。试验还进行了两种铸锭经轧制变形后的人工时效处理,普通DC铸造和低频电磁铸造的铝合金时效后的硬度都随时效时间延长,先升高、后降低,且低频电磁铸造2024铝合金时效后的硬度高于普通DC铸造2024铝合金。电磁铸造2024铝合金的硬度经过10h处理后达到峰值,普通DC铸造铝合金到达时效峰值的时间则有所滞后。     

预变形结合人工时效对Al-Mg-Si合金力学性能的影响

研究预变形结合人工时效处理对AA6060铝合金强度和韧性的影响。对经过均匀化热处理和挤压加工的AA6060铝合金进行固溶处理,然后对材料实施0-10%的预变形并再进行时效处理或者在人工时效过程中进行同步变形。通过对不同时效处理后的合金的显微硬度和拉伸性能分析,发现预变形对材料的时效行为和力学性能有显著影响,它可以使合金的时效速度明显加快。比较预变形和同步变形对人工时效的影响发现,同步变形结合人工时效可以使该合金在更短的时间内得到更好的力学性能。对两种变形对时效行为的影响机理进行了探讨。     

5083铝合金铸锭均匀化处理对铸锭和板材组织与性能的影响

系统研究了5083合金铸锭均匀化处理和不均匀化热处理对铸锭、成品板材组织和性能的影响。通过高温瞬时试验、剥落腐蚀试验、扫描电镜及力学性能试验,对经均匀化和不经均匀化的5083铝合金铸锭的轧制制品进行对比分析。     

均匀化处理对挤压态Mg-Al-Zn-0.1Y合金热变形行为及织构的影响

利用250～400℃、0.01～10 s^-1 Gleeble 3500热模拟机等温热压缩试验研究了均匀化处理对稀土Y微合金化挤压态Mg-Al-Zn合金热变形行为的影响,利用电子背散射衍射(EBSD)研究了均匀化热处理对其热变形织构的影响。建立了挤压态和均匀化处理态Mg-Al-Zn-0.1Y镁合金的Arrhenius型本构方程,绘制了代表稳态流动的0.5应变加工图。研究了均匀化热处理对合金热加工图的影响,发现均匀化处理拓宽了合金低温可加工区,提升了合金的低温可加工性,确定了挤压态合金的适宜加工区为(325～375℃、0.01～0.1 s^-1)和(350～375℃、1～10 s^-1),均匀化热处理态合金的适宜加工区为(275～325℃、0.01～0.1 s^-1)。均匀化热处理提升了合金的动态再结晶能力,弱化了挤压态合金热变形基面织构强度,提升了软取向部分比例,提高了挤压态镁合金的热成形性。     

3003铝合金连续挤压管扩径开裂原因及其消除措施

３００３铝合金管冲扩口径时，显微范置变形的不均匀性可导致扩口开裂。对挤压用铝合金杆进行均匀化处理，可消除这种现象。     

6063铝合金型材的力学性能

从合金化学成分、铸锭晶粒组织、均匀化热处理制度、风冷淬火工艺、停放时间、人工时效制度等方面,论述了为确保6063铝合金型材力学性能应采用的工艺措施。     

2006年《轻合金加工技术》总目次

题名作者期页·新年献词·新年献词…………………………………………………………………………………………钟利1(Ⅰ)·评论与综述·中国铝板带热轧回眸与展望………………………………………………芦德惠徐建平王祝堂1(1)变形铝合金均匀化热处理的应用现状与研究进展…………     

3104铝合金在复合热处理过程中组织变化研究

以再生3104铝合金材料为实验研究对象,借助Deform软件和实验分析了不同复合热处理条件下的微观组织。实验结果表明,将试样进行深冷处理24 h+580℃均匀化热处理10 h,得到的组织更加的均匀细小,组织中的Al6Mn相具有抑制晶粒粗化的作用。     

铝合金圆铸锭均热炉选择过程中几个值得注意的问题

结合我公司扩建中的工程项目,简要评述铝合金圆铸锭均热炉选择过程中的几个问题,它们涉及炉型的选择,炉子的生产效率和升温能力,加热温度均匀性,冷却室和均热-冷却炉组的节能等问题。阐述了笔者自己的见解。     

灰铸铁局部激冷效果的研究与应用

研究了灰铸铁局部激冷后的组织及硬度变化特征，通过试验确定了使用冷铁的工艺参数。生产试验结果表明，机床导轨处使用冷铁激冷，能有效地提高导轨面的铸态硬度，且导轨面硬度均匀性和床身断面均匀性提高。     

均匀化退火工艺对6060铝合金挤压材力学性能的影响

研究了不同均匀化退火制度对6060铝合金挤压型材性能的影响。通过对6060铝合金铸锭的金相显微组织和型材力学性能分析得出,在合适的均匀化退火制度下,可以有效消除6060铝合金铸锭组织的枝晶偏析和非平衡相的熔解,达到缩短均匀化时间,提高挤压速度、改善型材表面质量。     

Microstructure evolution during homogenization of Al–Mn–Fe–Si alloys: Modeling and experimental results

Microstructure evolution during the homogenization heat treatment of Al–Mn–Fe–Si, or AA3xxx, alloys has been investigated using a combination of modeling and experimental studies. The model is fully coupled to CALculation PHAse Diagram (CALPHAD) software and has explicitly taken into account the two different length scales for diffusion encountered in modeling the homogenization process. The model is able to predict the evolution of all the important microstructural features during homogenization, including the inhomogeneous spatial distribution of dispersoids and alloying elements in solution, the dispersoid number density and the size distribution, and the type and fraction of intergranular constituent particles. Experiments were conducted using four direct chill (DC) cast AA3xxx alloys subjected to various homogenization treatments. The resulting microstructures were then characterized using a range of characterization techniques, including optical and electron microscopy, electron micro probe analysis, field emission gun scanning electron microscopy, and electrical resistivity measurements. The model predictions have been compared with the experimental measurements to validate the model. Further, it has been demonstrated that the validated model is able to predict the effects of alloying elements (e.g. Si and Mn) on microstructure evolution. It is concluded that the model provides a time and cost effective tool in optimizing and designing industrial AA3xxx alloy chemistries and homogenization heat treatments.     

均匀化处理对6082铝合金组织和力学性能的影响

锻造铝合金零件在汽车行业已经得到广泛应用,为了能够生产出高性能的铝合金锻件,获得良好的铸造坯料显得尤为重要。采用不同工艺参数对6082铝合金试样进行均匀化处理,通过拉伸试验测量其拉伸性能,利用SEM和EDS分析其组织形貌和析出相成分。研究表明,均匀化处理工艺显著影响6082铝合金的性能。     

GH3625镍基合金的铸态组织及均匀化处理工艺研究

利用光学显微镜、扫描电镜和电子能谱仪研究了700℃超超临界发电机组缸体用GH3625镍基合金真空感应熔炼电极锭的铸态组织及均匀化处理工艺,得出GH3625真空感应熔炼电极锭的均匀化热处理工艺应为1200~1220℃保温32 h。     

MICROSTRUCTURES OF Mg-Zr,Mg-Zn AND Mg-Zn-Zr ALLOYS

Microstructural studies have been made on the Mg-0.54Zr,Mg-5.68Zn andMg-5.65Zn-0.50Zr alloys in the as-cast and homogenized states.The lenticular plates of{012}twins were found in three alloys.After homogenization,ZrH_2 phase formed in theMg-0.54Zr alloy.The Mg_7Zn_3 phase of cubic structure with a=1.417 nm distributes at thegrain boundaries of the Mg-5.68Zn alloy in the as-cast state and after homogenization,theMg_7Zn_3 phase dissolves and the MgZn_2 phase occurs.The as-cast Mg-5.65Zn-0.50Zr al-loy consists of MgZn_3 phase and Zn-Zr compounds.After homogenization,the dispersedacicular MgZn_2 phase may precipitate.     

电解铝液铸轧生产3102铝合金箔坯料工艺研究

用电解铝液做原料生产3102铝合金铸轧坯料,从熔炼、精炼、在线净化、晶粒细化、铸轧等各个生产环节入手,对影响铸轧板坯组织均匀性、晶粒度的工艺参数进行了研究,重点研究了铸轧速度和铸轧板厚度对3102铝合金箔材铸轧坯料的杯突值的影响。     

Microstructural modeling of the homogenization heat treatment for AA3XXX alloys

The microstructure evolution during homogenization of AA3XXX alloys involves i) the reduction in the microsegregation formed during solidification, ii) the nucleation, growth and coarsening of intra-granular dispersoids, and iii) the growth/dissolution of inter-granular constituent particles. A model that is able to simulate these phenomena and their interaction has been developed recently. It features fully coupling with CALPHAD software. In this paper, the homogenization model is introduced and its predictive power is demonstrated by successfully reproducing experimentally measured microstructure features for an industrial extrusion alloy (AA3003). As such, the model represents a valuable tool for optimizing the design of industrial AA3XXX alloy homogenization heat treatment parameters.     

Simulation of the transformation of iron intermetallics during homogenization of 6xxx series extrudable aluminum alloys

A computational simulation of the β-AlFeSi to α-AlFeSi transformation has been performed in this work by integrating the process steps of solidification and homogenization. The composition profiles of alloying elements as well as the profiles of weight fractions of all solid phases computed after solidification were entered as input for the simulation of the homogenization process which involves the dissolution of the Mg₂Si and the transformation of β-AlFeSi to α-AlFeSi intermetallics.