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金属学报  2015, Vol. 51 Issue (2): 216-222    DOI: 10.11900/0412.1961.2014.00283
  论文 本期目录 | 过刊浏览 |
磨球级配对MA-SPS原位合成Al13Fe4/Al复合材料的组织结构及力学性能的优化*
胡娜, 薛丽红, 顾健, 李和平, 严有为
华中科技大学材料成形与模具技术国家重点实验室, 武汉 430074
OPTIMIZATION OF GRADING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Al13Fe4/Al COM- POSITES IN SITU SYNTHESIZED BY MECHANICAL ALLOYING AND SPARK PLASMA SINTERING
HU Na, XUE Lihong, GU Jian, LI Heping, YAN Youwei
State Key Laboratory of Material Processing and Die &Mold Technology, Huazhong University of Science and Technology, Wuhan 430074; State Key Laboratory of Material Processing and Die & Mold Technology, Huazhong University of Science and Technology, Wuhan 430074
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摘要: 采用机械合金化-放电等离子体烧结(MA-SPS)技术原位合成近全致密的Al13Fe4/Al复合材料. 在MA过程中采用磨球级配对材料的组织结构和性能进行了优化. 利用XRD, SEM, TEM, 显微硬度计和力学性能测试系统等手段对粉末及烧结试样的组织结构和性能进行了分析表征. 结果表明, 相同MA时间下, 采用磨球级配可有效提高球磨效果, 其粉末粒径分布更均匀, 固溶度也得到很大的提高. SPS烧结后, 复合材料的组织由α-Al和金属间化合物Al13Fe4 2相构成. 金属间化合物Al13Fe4相的形态分为大颗粒(1~2 mm)、超细颗粒(0.1~1.0 mm)和纳米颗粒(20 nm) 3种, 其中大颗粒和超细颗粒Al13Fe4由未固溶的Fe与Al直接反应原位生成, 纳米颗粒Al13Fe4是Fe从过饱和Al(Fe)固溶体中析出生成. 采用磨球级配处理的Al-10Fe合金含有更多大颗粒α-Al和超细颗粒Al13Fe4, 因此它具有更优的综合力学性能, 显微硬度为227 HV, 抗压强度为845.8 MPa, 最大塑性变形量为13.6 %。
关键词 机械合金化放电等离子烧结原位合成Al13Fe4/Al复合材料级配    
Abstract:Al-Fe alloys are widely applied in automobile, aerospace, military industry and other fields owing to their high specific strength, high specific stiffness and good stability of the microstructure originating from the low diffusivity of Fe in Al. However, conventional casting method leads to inferior mechanical properties of Al-Fe alloys due to the coarse grain microstructure, which cannot meet application requirements. In this work, fully densed Al13Fe4/Al composites were fabricated by combination of mechanical alloying and spark plasma sintering (MA-SPS) approaches. Effect of gradation of grinding balls on microstructure and properties of composites was investigated by means of XRD, SEM, TEM, hardness and compressive test. The results showed that the size of powders became more uniform by ball gradation in MA treatment, and solid solubility was greatly enhanded as well. Furthermore, the Al-Fe powder after MA using a single grinding ball size showed the microstructure of tiny white Fe particles on the surface of each particle, while no white Fe particles were observed for the one with ball gradation, which confirmed that ball gradation was more beneficial to the mixture and solid solution of Al and Fe, resulting in more homogeneously distributed powders with smaller particle sizes of 10 μm. The composites after SPS contained α-Al phase and intermetallic compound Al13Fe4. Three types of Al13Fe4 were observed: large particles (1~2 μm), ultrafine particles (0.1~1.0 μm) and nano-particles (about 20 nm). The large particles and ultrafine Al13Fe4 formed by the reaction between undissolved Fe particles and the Al melt while nano-particles of Al13Fe4 originated from the precipitation of supersaturated Al(Fe) solid solutions. The sintered sample with ball gradation after SPS showed optimized microstructure with coarser α-Al particles and ultrafine Al13Fe4 particles, resulting in good comprehensive properties with 227 HV in microhardness, 845.8 MPa in compressive strength and 13.6% in plastic deformation. The combination of large quantities of coarse α-Al particles and ultrafine Al13Fe4 particles were considered as the reason for high strength and high toughness of Al-Fe alloy。
Key wordsmechanical alloying    spark plasma sintering    in situ synthesis    Al13Fe4/Al composite    gradation
收稿日期: 2014-05-27      出版日期: 2015-07-23
:  TG146.2  
Corresponding author: Correspondent: XUE Lihong, professor, Tel: (027)87543876, E-mail: xuelh@mail.hust.edu.cn     E-mail: xuelh@mail.hust.edu.cn
作者简介: 作者简介: 胡娜, 女, 1990年生, 硕士生

引用本文:

胡娜, 薛丽红, 顾健, 李和平, 严有为. 磨球级配对MA-SPS原位合成Al13Fe4/Al复合材料的组织结构及力学性能的优化*[J]. 金属学报, 2015, 51(2): 216-222.
HU Na, XUE Lihong, GU Jian, LI Heping, YAN Youwei. OPTIMIZATION OF GRADING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Al13Fe4/Al COM- POSITES IN SITU SYNTHESIZED BY MECHANICAL ALLOYING AND SPARK PLASMA SINTERING. Acta Metall Sin, 2015, 51(2): 216-222.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2014.00283      或      http://www.ams.org.cn/CN/Y2015/V51/I2/216

图1  未经放电等离子烧结(SPS) Al-10Fe粉末的EBSD像
图2  未经SPS烧结Al-10Fe粉末的XRD谱
图3  未经SPS烧结Al-10Fe粉末的晶粒尺寸、晶格应变、晶格常数和固溶度的变化
图4  经SPS烧结后Al-10Fe试样的XRD谱
图5  经SPS烧结后Al-10Fe粉末的EBSD像
图6  经SPS烧结后Al-10Fe粉末TEM像和SAED谱
图7  经SPS烧结后Al-10Fe粉末的压缩应力-应变曲线
表1  经SPS烧结后Al-10Fe粉末的EDS结果
表2  经SPS烧结后Al-10Fe粉末的力学性能
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