何天兵
,
初德胜
,
唐鹏钧
,
王兴元
,
何晓磊
,
李沛勇
,
胡仁伟
航空材料学报
doi:10.11868/j.issn.1005-5053.2015.6.003
利用快速凝固和低温球磨复合工艺制备Al-Cu-Mg合金粉末,通过冷压、热挤压工艺固结成形,并对其进行固溶和自然时效处理,研究该过程中材料的微观组织变化和力学性能.结果表明:球形Al-Cu-Mg合金雾化粉末球磨4h后全部变为层片状,CuAl2和Al2CuMg相发生分解并回溶入α(Al)基体中形成过饱和固溶体;挤压态材料的组织致密(致密度达98.6％),经热处理后平均晶粒尺寸约900nm,自然时效阶段合金中析出大量弥散分布的GP区和S"相;T4态材料的抗拉强度和屈服强度分别为526MPa和397MPa,而伸长率(15％)仍保持在较高水平,其强化方式主要为细晶强化和沉淀强化.
关键词:
Al-Cu-Mg合金
,
快速凝固
,
低温球磨
,
晶粒细化
,
组织性能
L.Y. Dai
,
B. Cao
,
M. Zhu
金属学报(英文版)
The cryogenic milling and milling in conjunction with dielectric barrier discharge plasma (DBDP) have been separately set up. The combined effect of low temperature and plasma on ball milling has been investigated by examining the refinement of particle size and grain size of iron powder using scanning electron microscopy, X-ray diffraction, and small angle X-ray scattering. It was found that the mean size of iron particles could reach 104nm only after 10 hours of ball milling in conjunction with DBDP, whereas a minimum average grain size of 8.4nm was obtained by cryomilling at －20℃; however, it is difficult to refine the particle size and grain size under the same milling condition in the absence of DBDP and cryogenic temperature.
关键词:
ball milling
,
null
,
null
杨滨
,
程军胜
,
樊建中
,
田晓风
,
陈汉宾
,
张济山
金属学报
利用液氮低温球磨技术制备了纳米晶Al-Zn-Mg-Cu合金粉体,分析了材料在球磨过程中微观组织变化.结果表明, 气雾化Al-Zn-Mg-Cu合金粉体随着球磨过程的进行晶粒尺寸逐渐减小, 球磨15 h后晶粒尺寸约为35 nm；MgZn2相逐步分解, 并最终过饱和固溶于α-Al中. 制备的纳米晶Al-Zn-Mg-Cu合金粉体低于709 K(0.77 Tm, Tm 为熔点)加热时, 晶粒长大速度缓慢; 709 K加热1 h 晶粒尺寸仅为71 nm. 研究表明, 液氮低温球磨过程中形成的Al2O3颗粒对晶粒的钉扎有效地提高了纳米晶Al-Zn-Mg-Cu合金粉体的热稳定性.
关键词:
低温球磨
,
nanocrystalline
,
Al-Zn-Mg-Cu alloy
