Improved structural homogeneity and mechanical properties of nanoparticles reinforced Al composites after orthogonal thermomechanical processes

JOURNAL OF ALLOYS AND COMPOUNDS

卷:767

Article

Liu, Jun¹  Chen, Zhe¹  Zhang, Fengguo¹  Ji, Gang²  Ma, Yu²  Wang, Mingliang³  Zhong, Shengyi³  Li, Jian⁴  Wang, Hong⁴  Wang, Haowei¹ 

[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[2] Univ Lille, CNRS, UMR 8207, Unite Mat & Transformat, F-59655 Villeneuve Dascq, France

[3] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[4] CAEP, Inst Nucl Phys & Chem, Key Lab Neutron Phys, Mianyang 621900, Peoples R China

关键词: Metal matrix composites;    Microstructures;    Mechanical properties;    Anisotropy;    Neutron diffraction;   

DOI  :  10.1016/j.jallcom.2018.07.083

来源: Elsevier

【 摘 要 】

Orthogonal thermomechanical processes consisting of a hot extrusion and the subsequent orthogonal rolling are proposed to disperse the nanoparticle clusters and optimize the grain structures of matrices in in-situ synthesized TiB2 particles reinforced Al-Zn-Mg-Cu composites. The particle distributions and grain structures of composites are investigated by scanning electron microscopy, electron backscatter diffraction and neutron diffraction techniques. Compared with the hot extruded counterparts, the composites fabricated by the new process exhibit uniform particle distributions, less elongated grains and weak textures, owing to the strain path change and enhanced recrystallizations. Both high strength (669 MPa and 606 MPa) and good ductility (11.1% and 14.2%), are achieved in the resultant composites along the longitudinal and transverse direction respectively. The underlying mechanisms for modified mechanical properties are discussed in detail from the perspectives of the uniform TiB2 particles and homogenized grain structures. (c) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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