Microstructure characteristics and enhanced tensile properties of in-situ AlN/ AZ91 composites prepared by liquid nitriding method-猫眼课题宝

液体氮化法原位AlN/AZ91复合材料的显微组织特征及增强拉伸性能

DOI：

10.1016/j.msea.2018.03.126

发表时间：

2018-05

期刊：

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing

影响因子：

6.4

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

Zhang Bin;Yang Changlin;Zhao Dongchen;Sun Yunxia;Wang Xiaobo;Liu Feng

采用液相氮化法在AZ 91镁合金基体中原位合成了纳米、亚微米和微米级AlN颗粒。根据热力学计算和实验结果，氮化反应生成AlN颗粒在基体AZ 91合金熔体中稳定完成。原位生成的AlN颗粒呈颗粒状和棒状均匀分布在基体中。结果表明，α-Mg晶粒明显细化，β-Mg 17 Al 12相数量减少，尺寸减小，大量位错被捕获，γ-Mg 17 Al 12相析出。结果表明，AlN/AZ 91金属型铸造复合材料具有较高的抗拉强度（240 ± 10 MPa）和断裂伸长率（20 ± 3%）。

Nano-, submicron- and micron-sized AlN particles were in situ synthesized in AZ91 matrix alloy by liquid nitriding method. According to thermodynamics calculation and experimental results, the nitriding reactions of AlN particle formation were stably completed in the matrix AZ91 alloy melt. And in situ formed AlN particles with the granular and rod-like shapes were uniformly distributed in the matrix. Thus, the grain sizes of α-Mg were significantly refined, the amount and sizes of β-Mg17Al12phases were decreased, and a lot of dislocations trapping and the precipitation of γ-Mg17Al12phase were induced in the AZ91 matrix alloy. As results, higher ultimate tensile strength (240 ± 10 MPa) and higher fracture elongation (20 ± 3%) were simultaneously improved for AlN/AZ91 permanent mold casting composites.