Formation of Amorphous State in Bulk Samples of the Iron-Based Multicomponent Alloys

Носенко, В. К.; Rudenko, О. Yu.; Moiseeva, T.N.; Maksimov, V. V.; Nizameyev, M. S.; Limanovskii, A.I.; Semyrga, O. M.; Tkatch, V.I.

doi:10.15407/mfint.37.12.1681

Cited by 3 publications

(2 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High cooling rates during LQ were achieved by the well-known splat-cooling technique by spreading a drop of melt on the inner surface of a rapidly rotating, heat-conducting copper cylinder. The maximum cooling rates estimated by the foil thickness were ~10 8 K/s [13,14]. The as-cast samples were obtained by pouring the melt into a copper mold.…”

Section: Methodsmentioning

confidence: 99%

Influence of Liquid Quenching on Phase Composition and Properties of Be-Si Eutectic Alloy

Башев

Ryabtsev

Kushnerov

et al. 2020

EEJP

View full text Add to dashboard Cite

By the method of quenching from the liquid state (splat-quenching), it is first revealed the formation of mixture of metastable supersaturated substitutional solid solutions in the eutectic alloy Be-33at.% Si. Cast samples are obtained by pouring melt into a copper mold. High cooling rates during liquid quenching are achieved throw the well-known splat-cooling technique by spreading a drop of melt on the inner surface of a rapidly rotating, heat-conducting copper cylinder. The maximum cooling rates are estimated by the foil thickness. The melt cooling rates (up to 108К/s), used in the work, are sufficient to form amorphous phases in some eutectic alloys with similar phase diagrams, but it is found those rates are insufficient to obtain them in the Be-Si eutectic alloy. The X-ray diffraction analysis is carried out on a diffractometer in filtered Cobalt Ka radiation. Microhardness is measured on a micro-durometer at a load of 50 g. The electrical properties, namely the temperature dependences of relative electrical resistance, are studied by the traditional 4-probe method of heating in vacuum. The accuracy of determining the crystal lattice period of the alloy, taking into account extrapolation of the reflection angle by 900, is ± 3•10-4 nm. It is found that even at extremely high rate of quenching from the melt, instead of the amorphous phase formation, the occurrence of two supersaturated substitutional solid solutions, based on Beryllium and Silicon, is revealed. This fact is established by the obtained dependences of their lattice periods values on the alloying element content. So, during the formation of metastable eutectic structure, a supersaturated with Beryllium solid solution of Silicon has period a = 0.5416 nm, and a supersaturated with Silicon solid solution of low-temperature hexagonal Beryllium has periods a = 0.2298 nm, c = 0.3631 nm. The positive role of the liquid quenching method in increasing the level of mechanical characteristics (microhardness and microstresses) in rapidly cooled Be-Si films is shown. It has been demonstrated that the difference in the atomic radii of the elements significantly affects the distortion of crystal lattices of the formed supersaturated solid solutions, and a significant value of microstresses (second-order stresses) in the Silicon lattice supersaturated with Beryllium is estimated, which, of course, leads to a significant increase in the microhardness, namely: there is an increase in microhardness in the Be-Si alloy under the conditions of applied method of quenching from the liquid state by more than 1.7 times compared to cast eutectic alloy and more than 6 times higher in comparison with the eutectoid cast Iron-Carbon alloy. The obtained polytherm of electrical resistance of the alloy under conditions of continuous heating in vacuum confirms the metastable nature of obtained new phases during quenching from the liquid state.

show abstract

Section: Methodsmentioning

confidence: 99%

Influence of Liquid Quenching on Phase Composition and Properties of Be-Si Eutectic Alloy

Башев

Ryabtsev

Kushnerov

et al. 2020

EEJP

View full text Add to dashboard Cite

show abstract

“…Amorphous metals are a relatively new class of metallic materials, which were of great interest in the middle and end of the last century and have an extensive bibliography [1][2][3][4][5][6][7]. Obtaining the amorphous state of metals in the solid phase is associated with the achievement of very high cooling rates (on average 106 K/s), which is achievable in cross sections up to several tens of micrometers.…”

Section: Introductionmentioning

confidence: 99%

Thermal processes under explosive loading of amorphous alloy powders

2021

View full text Add to dashboard Cite

The article deals with the state of production of bulk amorphous and nanocrystalline materials. Conditions for the preservation of the “X-ray” amorphous state in compact materials obtained by explosive pressing of amorphous alloy powders are formulated. The two-front Stefan problem is solved and it is shown that the cooling rate of liquid layers on the contact surfaces of powder particles under explosive loading corresponds to the critical quenching rate of the formation of amorphous structures in metal alloys.

show abstract

Influence of High Rates of Cooling on a Phase Composition and Physical Properties of the Co–Be and Cu–Be Alloys

Башев¹,

Kushnerov²,

Il’chenko³

et al. 2018

Metallofiz. Noveishie Tekhnol.

View full text Add to dashboard Cite

Методом закалки из жидкого состояния (ЗЖС) в сплавах Co-Be и CuBe обнаружено образование однородных сильнопересыщенных (до 23 ат.%Ве в сплаве Со-Ве и до 31,4 ат.%Ве в сплаве Сu-Ве) твёрдых растворов, имеющих состав исходной жидкости (С 0). При максимально достигнутых (10 7 К/с) скоростях охлаждения расплава, достаточных для формирования твёрдого аморфного состояния, не удаётся, однако, предотвратить процессы упорядочения в конгруэнтной эквиатомной фазе Co-Be (тип CsCl). В то же время для сплава Cu-Ве показано, что в условиях ЗЖС возможно формирование пересыщенного твёрдого раствора смешанного (внедрениязамещения) типа. Экспериментально подтверждено значительное при ЗЖС переохлаждение расплава ниже температуры распада фаз эвтектоидного состава-β 1-и β-фазы, соответственно, в сплавах Со-Ве и CuBe. Показана положительная роль метода ЗЖС в повышении уровня механических и магнитожёстких характеристик быстроохлаждённых плёнок. Ключевые слова: закалка из расплава, перитектическая и эвтектоидная реакции, эквиатомная фаза, магнитные характеристики, сильнопересыщенный твёрдый раствор. Методою гартування з рідкого стану (ГРС) у стопах Со-Ве та Сu-Ве вияв

show abstract

Formation of Amorphous State in Bulk Samples of the Iron-Based Multicomponent Alloys

Cited by 3 publications

References 30 publications

Influence of Liquid Quenching on Phase Composition and Properties of Be-Si Eutectic Alloy

Influence of Liquid Quenching on Phase Composition and Properties of Be-Si Eutectic Alloy

Thermal processes under explosive loading of amorphous alloy powders

Influence of High Rates of Cooling on a Phase Composition and Physical Properties of the Co–Be and Cu–Be Alloys

Contact Info

Product

Resources

About