Microstructure homogeneity of milled aluminum A356-Si3N4 metal matrix composite powders

被引：20

作者：

Fernandez, Heydi ^{[1
]}

Ordonez, Stella ^{[1
]}

Pesenti, Hector ^{[2
]}

Espinoza Gonzalez, Rodrigo ^{[3
]}

Leoni, Matteo ^{[4
]}

机构：

[1] Univ Santiago Chile, Dept Ingn Met, Av Lib Bdo OHiggins 3363, Santiago, Chile

[2] Univ Catolica Temuco, Fac Ingn, Rudecindo Ortega 02950, Temuco, Ix Region De La, Chile

[3] Univ Chile, Dept Ingn Quim Biotecnol & Mat, FCFM, LabMAM, Av Beauchef 851, Santiago, Chile

[4] Univ Trento, DICAM, I-38123 Mesiano, Trento, Italy

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2019年 / 8卷 / 03期

关键词：

Mechanical milling; Aluminum matrix composite; Microstructure inhomogeneity; Scherrer equation; WPPM; LATTICE-PARAMETER VARIATION; MECHANICAL-PROPERTIES; STRAIN-RATE; CONSOLIDATION; INTERFACE; BEHAVIOR; SIZE; TEMPERATURE; PARTICLES; EVOLUTION;

D O I：

10.1016/j.jmrt.2019.05.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A metal matrix composite was produced by co-milling an A356 aluminum alloy powder obtained by rotating electrode off-equilibrium solidification, with different mass fractions (10, 20 and 30%) of Si3N4. The structural and microstructural modifications occurring during the milling were investigated with X-ray powder diffraction (XRPD). Whole powder pattern modeling (WPPM) of the XRPD reveals the inhomogeneous nature of the material in terms of silicon content and allows the crystallite size distribution and dislocation content to be followed in detail for all phases present in the powder. Neither microscopy nor the traditional Scherrer equation can reveal such a detailed picture in this case. Short milling times are sufficient to homogenize the microstructure and to obtain nanoscale crystallites. Long milling times are advantageous to increase the dislocation density that might be favorable for subsequent sintering. (C) 2019 The Authors. Published by Elsevier B.V.

引用

页码：2969 / 2977

页数：9

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