Laves phases

Laves phases

Laves phase refers to a group of three inter-metallic compounds with the stoichiometry of AB2, including C15 with a face-center-cubic MgCu2 structure, C14 with a hexagonal MgZn2 structure, and C36 with a dihexagonal MgNi2 structure. They are the largest group of intermetallic compounds and are used as strengthening materials due to their high strength and oxidation resistance, particularly at high temperatures. Laves phases exist in three different structure types and have a wide range of properties.From: Handbook of Nanomaterials for Hydrogen Storage [2017], Advanced Structural Materials [2019], On the synthesis and characterisation of novel composite-structured high-entropy alloys [2019], Materials for Sustainable Energy Applications [2019]

ZrV2-Based Hydrogen Storage Alloys

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Published in Mieczyslaw Jurczyk, Handbook of Nanomaterials for Hydrogen Storage, 2017

Marek Nowak, Mieczyslaw Jurczyk

Laves phases are a group of three topologically highly closed-packed inter-metallic compounds with the stoichiometry of AB2: C15 with a face-center-cubic MgCu2 structure, C14 with a hexagonal MgZn2 structure, and C36 with a dihexagonal MgNi2 structure [17,22]. Most of the research focus on the C14 (ZrV2) and C15 (Zr0.35Ti0.65V0.85Cr0.26Ni1.30) phases. The C36 phase may be an intermediate phase between C14 and C15 [22–24]. The main controlling factor for the C14/C15 ratio is the average electron density (e/a), geometric atomic size ratio, and difference in electro negativity [25].

On the synthesis and characterisation of novel composite-structured high-entropy alloys

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Published in Philosophical Magazine Letters, 2019

Anil Kumar, Digvijay Parganiha, Jageshwar Verma, Prasenjit Biswas, A. Basu, Manoj Chopkar

Figure 3a shows the hardness and wear resistance of the HEAs. The maximum hardness of 690 ± 5 HV was observed in CoCrFeNi3Si alloy compared to 595 ± 4 and 530 ± 5 HV for CoCrFe2Ni2Si and Co2CrFeNi2Si HEAs, respectively. Similar to the increasing hardness trend, the wear resistance also increases. High hardness is attributed to the formation of a hard Ni3Si intermetallic compound. Ni3Si is a L12-structured (ordered FCC Cu3Au prototype) intermetallic (metal-metalloid) compound [10]. Laves phases are the largest group of intermetallic compounds and used as the strengthening material owing to their high strength [11].

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ZrV2-Based Hydrogen Storage Alloys

On the synthesis and characterisation of novel composite-structured high-entropy alloys