Natural and artificial aging in Mg-Gd binary alloys

Stulı́ková, Ivana; Smola, Bohumil; Čı́žek, Jakub; Kekule, Tomáš; Melikhova, Oksana; Kudrnová, Hana

doi:10.1016/j.jallcom.2017.12.026

Cited by 18 publications

(4 citation statements)

References 44 publications

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“…In addition; it greatly influences the morphology, size and density number of the main strengthening phases formed during AA [30], GP zones, β″, β′ phase, etc as well as their precipitation value contribution to the alloy [25]. As a result of the literature; Mg alloys such as Mg-RE [27], Mg-8Li-3Al-2Zn-0.5Y [28], ZK60 [31], Mg-3Sn-1Al [32], Mg-3Sn-2Zn-1Al [32] and Mg-Gd [26] were aged by AA method and aging/property correlation was investigated.…”

Section: Introductionmentioning

confidence: 98%

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A basic study on artificial aging in Mg-10Al₁₂Si+1Pb alloy

Çiçek

Aydoğmuş

Sun

2020

Mater. Res. Express

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In this study, research has been made on the aging of metal matrix composite materials produced by the in situ casting system. Mg matrix composite material was produced by the in situ casting system. In this study, 90%Mg+10% Al 12 Si (wt) ingot casting was performed for alloy formation and 1% Pb was added as an alloying element to the melted structure. This study aims to examine the effect of the artificial aging (AA) process on hardness and microstructure after alloying and composite of Mg metal. The in situ casting system was used in the casting of Mg alloy under the Ar gas atmosphere. The material after required casting homogenization process; for the AA process, they were embedded in a powder graphite filled vessel and kept at 350°C for 1 h and then quenched (with 25°C water). Later; after quenching, the materials were kept at 150°C for 2, 4, 12, 16 and 24 h and aged samples were obtained. Microstructure images were obtained from the samples by scanning electron microscope (SEM) and light optical microscope (LOM) and then the hardness values of the micro hardness device were measured. Grain structure because of AA heat treatment; showed changes according to un-aging material. The hardness value is directly proportional to the increasing aging time of the materials applied to the AA process; it was found that the levels increased approximately to 45% (86HV to 125HV) compared to the un-aging material and passed to the fixing phase.

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Section: Introductionmentioning

confidence: 98%

“…Aging process in materials is divided into two basic groups. The aging process is known as natural aging (NA) and artificial aging (AA) [25,26]. It is known that precipitate, particles, intermetallic, phase, etc structures within the metal matrix can be distributed homogeneously and heterogeneously because of temperature/time process [27].…”

Section: Introductionmentioning

confidence: 99%

A basic study on artificial aging in Mg-10Al₁₂Si+1Pb alloy

Çiçek

Aydoğmuş

Sun

2020

Mater. Res. Express

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“…Considering the special strengthening role of the long-period stacking ordered (LPSO) structure and its remarkable galvanic corrosion effect with α-Mg matrix, the Mg-RE-TM (RE and X represent rare earth elements and transition elements) series alloys with an LPSO phase have great potential as candidate materials for fracturing tools because of their excellent mechanical properties at both room and elevated temperatures. [9][10][11][12] Moreover, Ni, as an alloying element, whose addition on the one hand accelerates the degradation rate of the alloy originating from severe microgalvanic corrosion between the Ni-containing phase and Mg matrix, providing the cathodically active position of the corrosion couples. [13,14] On the other hand, the Ni addition could significantly enhance the strength and ductility of the alloy by grain refinement, LPSO strengthening, and texture weakening.…”

Section: Introductionmentioning

confidence: 99%

A Rapidly Degradable Extruded Mg–Y–Zn–Ni Alloy for Fracturing Tool Applications

Jiang

et al. 2023

Adv Eng Mater

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Microstructure evolution, mechanical properties, and degradation behavior of a rapidly degradable extruded Mg-2Y-0.5Zn-0.5Ni (at%) alloy for fracturing tool applications are investigated. The microstructure of the extruded alloy is mainly composed of a recrystallization region and a nonrecrystallization region, in which the 18 R-long-period stacking order (LPSO) phase with two kinds of morphologies are distributed along extrusion direction. Parts of 18R-LPSO phase transfer into 14 H-LPSO phase during extrusion. A small amount of 14H-LPSO phases precipitate in the α-Mg matrix. The extruded alloy exhibits good mechanical properties, the ultimate tensile strength, tensile yield strength, and ultimate compressive stress of the extruded alloy are 364, 316, and 389 MPa, which increase by 97.5%, 334%, and 32.8% as compared with that of the as-cast alloy, respectively, which are attributed to grain refinement, LPSO phase strengthening, and texture strengthening. More importantly, the immersion and electronic chemical tests indicate that the extruded alloy has a high degradation rate (17.5 mg cm À2 h À1 ). The rapid degradation rate of the extruded alloy is mainly due to the introduction of a significant number of defects especially for the microgalvanic corrosion between the LPSO phase and the α-Mg matrix.

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“…Accordingly, the influence of thermomechanical processing and artificial aging on the microstructure especially the precipitation behaviour and mechanical properties are widely investigated in Mg-RE alloys to control their design with better properties [8][9][10][11][12][13][14][15]. Nevertheless, only a few investigations can be found in the literature dealing with the impact of natural aging on the hardening behaviour of Mg-RE alloys [16][17][18][19][20][21]. Age-hardening was noticed in binary Mg-15Gd and Mg-13Tb (wt.%) alloys during natural aging at room temperature for 1 month due to the clustering of solute atoms and vacancies [16].…”

Section: Introductionmentioning

confidence: 99%