Effect of heat treatment on microstructures and mechanical properties of a cast Mg-Y-Nd-Zr alloy

Li, Huizhong; Lv, Feng; Liang, Xiaopeng; Yao, Qi; Zhu, Zexiao; Zhang, Kelong

doi:10.1016/j.msea.2016.05.014

Cited by 36 publications

(6 citation statements)

References 20 publications

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“…The conventional heat treatment processes of magnesium alloys are divided into annealing and solution and aging treatment [ 24 , 25 , 26 ]. Heat treatment can improve the mechanical properties of the alloy by controlling the microstructure of the material, such as grain size, point defects, dislocation entanglement and precipitated phase, etc.…”

Section: Introductionmentioning

confidence: 99%

The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment

Liu

Yang

et al. 2021

Materials

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There is a new long-period stacking ordered structure in Mg–RE–Zn magnesium alloys, namely the LPSO phase, which can effectively improve the yield strength, elongation, and corrosion resistance of Mg alloys. According to different types of Mg–RE–Zn alloy systems, two transformation modes are involved in the heat treatment transformation process. The first is the alloy without LPSO phase in the as-cast alloy, and the MgxRE phase changes to 14H-LPSO phase. The second is the alloy containing LPSO phase in the as-cast state, and the 14H-LPSO phase is obtained by the transformations of 6H, 18R, and 24R. The effects of different solution parameters on the second phase of Mg–9Gd–2Y–2Zn–0.5Zr alloy were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The precipitation mechanism of 14H-LPSO phase during solution treatment was further clarified. At a solution time of 13 h, the grain size increased rapidly initially and then decreased slightly with increasing solution temperature. The analysis of the volume fraction of the second phase and lattice constant showed that Gd and Y elements in the alloy precipitated from the matrix and formed 14H-LPSO phase after solution treatment at 490 °C for 13 h. At this time, the hardness of the alloy reached the maximum of 74.6 HV. After solution treatment at 500 °C for 13 h, the solid solution degree of the alloy increases, and the grain size and hardness of the alloy remain basically unchanged.

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Section: Introductionmentioning

confidence: 99%

The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment

Liu

Yang

et al. 2021

Materials

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“…Magnesium alloys have received remarkable attention in applications where weight saving is of great importance due to their low density and high specific strength. [1][2][3] So far, adding rare earth (RE) elements into Mg matrix is one of the effective methods to improve the mechanical properties, [4][5][6][7][8][9] and thus many Mg-RE systems have been developed, such as the Mg-Y system, [10,11] Mg-Gd system, [12][13][14] Mg-Nd system, [15,16] Mg-Ce system, [17,18] etc. Among them, Mg-Gd-based alloys showed promising potential because the maximum solubility of Gd in Mg is really high (23.49 wt% at 548 C), [19] and it decreases rapidly with decreasing temperature.…”

Section: Introductionmentioning

confidence: 99%

Substitution Effects of Gd with Nd on Microstructures and Mechanical Properties of Mg–10Gd–0.4Zr Alloys

et al. 2020

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The microstructures and mechanical properties, especially the contribution of individual strengthening mechanisms, of Mg–10Gd–0.4Zr alloy with the partial substitution of Gd with Nd are studied. The results show that Mg12Nd phases appear in the as‐cast alloys when substituting Gd with Nd, and the volume fraction of the secondary phase increases with increasing Nd content. After solution heat treatment, secondary phases fully dissolve into α(Mg) matrix except for Mg–5Gd–5Nd–0.4Zr alloy, which is attributed to a high Nd content in that alloy, beyond the maximum solubility of Nd in Mg. Age‐hardening curves indicate that substituting Gd with Nd shortens the incubation time and improves the peak hardness. The peak‐aged Mg–7Gd–3Nd–0.4Zr alloy shows improved mechanical properties with the yield strength, ultimate tensile strength, and elongation of 195 MPa, 294 MPa, and 3.9%, respectively, which is attributed to the dense β″ and β′ precipitates formed during aging. Furthermore, the contributions of individual strengthening mechanisms in Mg–Gd–Nd–Zr alloys after different heat treatments are calculated, and the results show that the substitution of Gd with Nd significantly enhances the contribution of precipitation strengthening, especially in peak‐aged Mg–7Gd–3Nd–0.4Zr alloy.

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“…Kula et al investigated the deformation behavior of the Mg-Y alloy and revealed that the Y addition could change the fracture mode by improving the dislocation movement [21]. The research of Li et al investigated the Nd doped Mg-ZnZr alloy and exhibited that the Nd presence would increase the strength of the alloy obviously [22]. And moreover the precipitation by the aging treatment improved the strength of the alloy further.…”

Section: Introductionmentioning

confidence: 99%

Influence of heat treatment and hot extrusion on the microstructure and tensile properties of rare earth modified Mg-Zn based alloy

Sheng

Wang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In the present paper, the Mg-Zn-Y-Nd alloy was prepared by casting, heat treatment and hot extrusion. The microstructure and mechanical properties of the alloys were tested by OM, SEM, TEM and tensile test. The results showed that the Mg 3 Zn 2 Y 3 phase is the main strengthening phase and forms the eutectic structure with α-Mg matrix in the as cast alloy. The strengthening phases semi-continuously connect and separate the α-Mg matrix into cell structure. The average grain size of the as cast alloy is about 60 μm. The heat treatment promotes the solid solution of the strengthening phase and precipitation of small particles inside grain.Compared with the as cast alloy, the heat treatment increases grain size a little and mechanical properties more than 30%. The hot extrusion refines the grain and strengthening phase, which increase the mechanical properties significantly. Moreover, the great deformation by the hot extrusion results in the ultrafine structure and abundant of crystal defects. The intersection of micro-twins lead to the special region with nanometer size. IntroductionMagnesium (Mg) alloys have attracted great attention as the light weight structural materials owing to their high specific strength, low density, ease of recycling and good damping, which can be applied in many fields, including implants, hand tools, sports equipment, automobiles, aerospace applications and electronic equipment [1][2][3][4]. Moreover, the recent research exhibited that the clinic trial of coronary stent made by rare earth doped Mg alloy exhibited good therapeutic effect without thrombosis, which demonstrated the good application prospect of Mg based implant [5]. However, the hexagonal closepacked (HCP) crystal structure of Mg limited the number of initiation slip systems during deformation at relative low temperature, which resulted in the poor deformability of Mg alloy [6]. The poor ductility and low strength of Mg alloy handicapped its wide application. To conquer these shortcomings of Mg alloy, many methods had been applied [7][8][9]. Alloying and thermal processing had been thought as the efficient method to improve the mechanical properties of Mg alloy at room and high temperature.Recently, the investigations [10-12] on biomedical magnesium alloys revealed that the addition of Zn could improve its mechanical properties and corrosion resistance with little influence on its biocompatibility, because the Zn is the essential element of the human body. Then a series of new magnesium alloys for biomedical application were developed [13][14][15]. The research of Zhang et al. [10] exhibited that Zn addition in Mg could increases the mechanical performance and biocompatibility, and the Mg-6Zn (wt.%) alloy was the best choice. But the mechanical properties of Mg-Zn alloy is not

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Effect of heat treatment on microstructures and mechanical properties of a cast Mg-Y-Nd-Zr alloy

Cited by 36 publications

References 20 publications

The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment

The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment

Substitution Effects of Gd with Nd on Microstructures and Mechanical Properties of Mg–10Gd–0.4Zr Alloys

Influence of heat treatment and hot extrusion on the microstructure and tensile properties of rare earth modified Mg-Zn based alloy

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