Eutectic/eutectoid multi-principle component alloys: A review

Baker, I.; Wu, Margaret; Wang, Zhangwei

doi:10.1016/j.matchar.2018.07.030

Cited by 92 publications

(16 citation statements)

References 68 publications

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“…On the periphery of the core in rim-I, we observe areas with a complex dendrite structure with inclusions of Au-I and sulfoarsenides (Rh, Pt, ± Os, Ru, Ir). They correspond to the structure of the eutectic-decomposition multi-principle component alloys (MPCAs) [54]. The presence of sulfide globules and areas with a multicomponent eutectic melt indicates the possible crystallization of the Pt-Fe alloy from a multicomponent melt containing Pt-Fe-Pd-Rh-Au-Ag-As-S.…”

Section: Discussionmentioning

confidence: 97%

Micrometric Inclusions in Platinum-Group Minerals from Gornaya Shoria, Southern Siberia, Russia: Problems and Genetic Significance

et al. 2019

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Micrometric inclusions in platinum-group minerals (PGMs) from alluvial placers carry considerable information about types of primary rocks and ores, as well as conditions of their formation and alteration. In the present contribution, we attempt to show, with concrete examples, the significance of the data on the composition and morphology of micrometric inclusions to genetic interpretations. The PGM grains from alluvial placers of the Gornaya Shoria region (Siberia, Russia) were used as the subject of our investigation. In order to determine the chemical composition of such ultrafine inclusions, high-resolution analytical methods are needed. We compare the results acquired by wavelength-dispersive spectrometry (WDS; electron microprobe) and energy-dispersive spectrometry (EDS) and scanning electron microscopy (SEM) methods. The results obtained have good convergence. The EDS method is multi-elemental and more effective for mineral diagnostics in comparison with WDS, which is its certain advantage. The possible conditions for the formation of inclusions and layers of gold, sulfoarsenides and arsenides in Pt3Fe grains, which have an original sub-graphic and layered texture pattern, are discussed. They are the result of solid solution and eutectic decompositions and are associated with the magmatic stages of grain transformation, including the result of the interaction of Pt3Fe with a sulfide melt enriched with Te and As.

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Section: Discussionmentioning

confidence: 97%

Micrometric Inclusions in Platinum-Group Minerals from Gornaya Shoria, Southern Siberia, Russia: Problems and Genetic Significance

et al. 2019

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“…Firstly, it can be seen from Table 3 that Al, Ti elements with larger radius than other elements, enhanced the lattice crystal distortion and the effect of solid solution strengthening [15,31]. Secondly, the formation of the hard oxidation or the second phase grains, such as TiC existing in the coating (Figure 3c,f,i), hindered the dislocation movement remarkably [32]. The existence of the TiC phase was beneficial to the wear resistance.…”

Section: Microstructure Of the Alcocrfeniti Heacsmentioning

confidence: 98%

Phase Evolution, Microstructure and Mechanical Property of AlCoCrFeNiTi High-Entropy Alloy Coatings Prepared by Mechanical Alloying and Laser Cladding

Wang

et al. 2019

Metals

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AlCoCrFeNiTi high-entropy alloy coatings (HEACs) were prepared by mechanical alloying (MA) and laser cladding (LC) process on H13 hot-working die steel substrate. Phase evolution, microstructure, and mechanical properties of the alloyed powder and HEACs were investigated in detail. The final milling AlCoCrFeNiTi coating powders exhibited simple body centered cubic (BCC) phase and mean granular size of less than 4 μm. With the increase of heat input of the laser, partial BCC phase transformed into minor face centered cubic (FCC) phase during LC. AlCoCrFeNiTi HEACs showed excellent metallurgical bonding with the substrate, and few defects. Moreover, the microhardness of AlCoCrFeNiTi HEACs reached 1069 HV due to the existence of the hard oxidation and the second phase grains, which are about five times that of the substrate. The laser surface cladding HEACs exhibited deteriorated tensile property compared with that of the substrate and the fracture generally occurred in the region of HEACs. The fracture mechanism of AlCoCrFeNiTi HEACs was dominated by the comprehensive influence of brittle fracture and ductile fracture.

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“…The strength of many HEAs can be enhanced without a noticeable reduction in ductility through controllable precipitation of second-phase particles [5][6][7][8][9] . In this regard, eutectic HEAs (EHEAs) emerged as a promising way to achieve balanced properties [10][11][12] . EHEAs can be considered as natural, self-organized in situ composites due to a fine lamellar/rod-like structure formed already in the as-cast state.…”

Section: Introductionmentioning

confidence: 99%