Characterization of anisotropic behaviour of ZK60 extrusion under stress-control condition and notes on fatigue modeling

Pahlevanpour, Amirhossein; Behravesh, Seyed Behzad; Adibnazari, Saeed; Jahed, Hamid

doi:10.1016/j.ijfatigue.2019.05.030

Cited by 20 publications

(12 citation statements)

References 54 publications

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“…Mg wrought alloys usually develop a pronounced basal fiber texture during extrusion. 27,28 In contrast, we unexpectedly observed a weak, tilted basal fiber texture in the mechanically milled materials. The weak texture and the tilting of the c-axis can only be partially explained by the decrease in grain size and the randomization of grain orientations due to dynamic recrystallization.…”

Section: Specifics Of the Microstructurementioning

confidence: 57%

Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Hübler

Winkler

Riedel

et al. 2021

Fatigue Fract Eng Mat Struct

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Metal-ceramic nanocomposites are promising candidates for applications necessitating light weight and excellent fatigue resistance. We produced Mg-SiC nanocomposites from mechanically milled powders, yielding a homogeneous nanocrystalline structure and excellent quasistatic strength values. Little is known, however, about the fatigue behavior of such composites. Here, we used load increase tests on the macroscale to yield estimation values of the fatigue endurance limit. Fatigue strength increased significantly for the materials processed by the powder metallurgical route. We further investigated the cyclic deformation behavior under stress-controlled conditions on the macroscale and nanoscale. Cyclic nanoindentation showed that indentation depth and cyclic plastic deformation decreased with increasing reinforcement content, hinting to a higher cyclic strength and corroborating the results from the macroscopic load increase tests. Our results therefore show that cyclic nanoindentation reliably determines the plastic deformation behavior of Mg nanocomposites offering the possibility of fast material analysis.

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Section: Specifics Of the Microstructurementioning

confidence: 57%

Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Hübler

Winkler

Riedel

et al. 2021

Fatigue Fract Eng Mat Struct

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“…Expressions appearing in equations (2) and (9) Expressions of transformed stiffness constants C ij appearing in equation 2:…”

Section: Fundingmentioning

confidence: 99%

“…Sometimes, anisotropy may arise as a result of the material forming processes. For example, magnesium alloys exhibit material anisotropy as they are formed under rolling and extrusion [1, 2]. In other cases, there is a need for controlled anisotropy, dependent on specific applications, such as biological implants used in dentistry.…”

Section: Introductionmentioning

confidence: 99%

Partial slip contact analysis for a monoclinic half plane

Çömez

Alinia

Güler

et al. 2020

Mathematics and Mechanics of Solids

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In this paper, the nonlinear partial slip contact problem between a monoclinic half plane and a rigid punch of an arbitrary profile subjected to a normal load is considered. Applying Fourier integral transform and the appropriate boundary conditions, the mixed-boundary value problem is reduced to a set of two coupled singular integral equations, with the unknowns being the contact stresses under the punch in addition to the stick zone size. The Gauss–Chebyshev discretization method is used to convert the singular integral equations into a set of nonlinear algebraic equations, which are solved with a suitable iterative algorithm to yield the lengths of the stick zone in addition to the contact pressures. Following a validation section, an extensive parametric study is performed to illustrate the effects of material anisotropy on the contact stresses and length of the stick zone for typical monoclinic fibrous composite materials.

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“…Bu alaşımlar genellikle ikili veya üçlü alaşım sistemi olarak tasarlanmaktadır. İkili alaşım sistemlerinden bazıları AZ91, AZ31, AM60, AS21, ZK60, TZ54 magnezyum alaşımlarıdır [1,8,10,12,14,15]. Üçlü alaşım sistemlerine ise TAS831, TAZ811, TAZ1031, magnezyum alaşımları örnek olarak gösterilebilir [16][17][18].…”

Section: Introductionunclassified

Sıcak Presleme Yöntemiyle Üretilen Nb Takviyeli Mg Matrisli Kompozitlerin Mikroyapı ve Mekanik Özellikleri

Erçetin

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Toz metalurjisi (T/M) yöntemi, kompozit malzemelerin üretiminde en iyi yöntemlerden birisidir. Ancak, magnezyum (Mg) tozlarının tutuşma riski sebebiyle Mg matrisli kompozitlerin bu yöntemle üretimi sınırlıdır. Bu çalışmada, Mg matrisli Nb partikül takviyeli kompozitlerin sıcak presleme yöntemiyle üretimi gerçekleştirilmiştir. Toz karışımlarının hazırlanması işleminden önce Mg tozlarının havayla temasını önlemek için parafin ile kaplama işlemi uygulanmıştır. Sinterleme işlemleri 630 o C sıcaklıkta, 50 MPa basınç altında ve 90 dk süreyle gerçekleştirilmiştir. Mikroyapı incelemeleri taramalı elektron mikroskobu (SEM), enerji dağılımlı spektroskopi (EDS) ve x-ışını kırınımı (XRD) analizleri ile, mekanik özellik incelemeleri ise sertlik testleri ile gerçekleştirilmiştir. Elde edilen sonuçlara göre, %98'in üzerinde bağıl yoğunluk değerine sahip oldukça yoğun yapıda kompozitler elde edilmiştir. SEM görüntülerinde de gözenek oluşumuna rastlanmamıştır. XRD analizinde α-Mg, Mg2Sn, MgZn ve Nb fazlarına ait pikler oluşmuştur. Nb partikül takviyesi ile mekanik özelliklerde artış sağlanmıştır (80,1 HV(0,3)'den 101,3 HV(0,3)sertlik değerine kadar).

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Characterization of anisotropic behaviour of ZK60 extrusion under stress-control condition and notes on fatigue modeling

Cited by 20 publications

References 54 publications

Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Partial slip contact analysis for a monoclinic half plane

Sıcak Presleme Yöntemiyle Üretilen Nb Takviyeli Mg Matrisli Kompozitlerin Mikroyapı ve Mekanik Özellikleri

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