Preparation of iron nitride powders through mechanical alloying and atmospheric heat treatment

Refractory high-entropy alloy (RHEA) is one of the most promising materials for use in high-temperature structural materials. In this study, the WMoNbTaV coatings on 304 stainless steel substrates has been prepared by mechanical alloying (MA). Effects of V addition and subsequent heat treatment on properties of the WMoNbTaV coatings were investigated. The results show that the RHEA coatings with nanocrystalline body-centered cubic (BCC) solid-solution phase were generated by the mechanical alloying process. The presence of the V element promotes a uniform microstructure and homogeneous distribution of composition in the RHEA coatings due to improving alloying efficiency, resulting in an increase of hardness. After the annealing treatment of the RHEA coatings, microstructure homogeneity was further enhanced; however, the high affinity of Ta for oxygen causes the formation of Ta-rich oxides. Annealing also removes strain hardening generated by high-energy ball milling and thus decreases the hardness of the RHEA coating and alters microstructure evolution and mechanical properties.

Download Full-text

Magnetic Characteristics of CuCr2S4Nanospinels Obtained by Mechanical Alloying and Heat Treatment

IEEE Transactions on Magnetics ◽

10.1109/tmag.2017.2712764 ◽

2017 ◽

Vol 53 (11) ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

E. Maciazek ◽

E. Malicka ◽

M. Karolus ◽

J. Panek ◽

Z. Stoklosa ◽

...

Keyword(s):

Heat Treatment ◽

Mechanical Alloying ◽

Magnetic Characteristics

Download Full-text

Investigation of Microstructure and Property of Fe3Al/Al2O3 Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.150-151.1409 ◽

2010 ◽

Vol 150-151 ◽

pp. 1409-1412 ◽

Cited By ~ 1

Author(s):

Tao Jiang

Keyword(s):

Heat Treatment ◽

Phase Composition ◽

Mechanical Alloying ◽

Sintering Process ◽

Composite Powders ◽

Al2o3 Composite ◽

Al2o3 Phase ◽

The Mean ◽

Xrd Patterns ◽

Al2o3 Matrix

The Fe3Al/Al2O3 composites were fabricated by pressureless sintering process. The Fe3Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe3Al powders and Al2O3 powders were mixed and the Fe3Al/Al2O3 composite powders were prepared, so the Fe3Al/Al2O3 composites were fabricated by sintering process at 1700oC for 2h. The phase composition and microstructure of Fe3Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical properties of the Fe3Al/Al2O3 composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al2O3 phase in the sintered composites. The Fe3Al/Al2O3 composites sintered bulks exhibited the homogenous and compact microstructure, the Fe3Al particles were homogenously distributed in the Al2O3 matrix, the mean particles size of Fe3Al intermetallics was about 3-5μm. The Fe3Al/Al2O3 composites exhibited more homogenous and compact microstructure with the increase of Fe3Al content in the Al2O3 matrix. The density and relative density of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The fracture strength and fracture toughness of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The elastic modulus and hardness (HRA) of the Fe3Al/Al2O3 composites decreased gradually with the increase of Fe3Al content.

Download Full-text