Indentation creep behavior of AE42 and Ca-containing AE41 alloys

Deming, Huang; Chen, Yungui; Tang, Yongbai; Li, Hongmei; Niu, Gao

doi:10.1016/j.matlet.2006.06.064

Cited by 25 publications

(13 citation statements)

References 10 publications

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“…During the last few decades, disadvantages such as vulnerability to corrosion, limited high temperature strength, and creep resistance have been overcome by the development of advanced magnesium alloys containing rare earth elements [1][2][3], calcium [4,5], strontium [6,7], tin [8,9], or barium [10]. However, improvements achieved through novel alloy development are limited.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound Assisted Casting of an AM60 Based Metal Matrix Nanocomposite, Its Properties, and Recyclability

Dieringa

Katsarou

Buzolin

et al. 2017

Metals

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An AM60 magnesium alloy nanocomposite reinforced with 1 wt % of AlN nanoparticles was prepared using an ultrasound (US) assisted permanent-mould indirect-chill casting process. Ultrasonically generated cavitation and acoustic streaming promoted de-agglomeration of particle clusters and distributed the particles throughout the melt. Significant grain refinement due to nucleation on the AlN nanoparticles was accompanied by an exceptional improvement in properties: yield strength increased by 103%, ultimate tensile strength by 115%, and ductility by 140%.Although good grain refinement was observed, the large nucleation undercooling of 14 K limits further refinement because nucleation is prevented by the formation of a nucleation-free zone around each grain. To assess the industrial applicability and recyclability of the nanocomposite material in various casting processes, tests were performed to determine the effect of remelting on the microstructure. With each remelting, a small percentage of effective AlN nanoparticles was lost, and some grain growth was observed. However, even after the third remelting, excellent strength and ductility was retained. According to strengthening models, enhanced yield strength is mainly attributed to Hall-Petch strengthening caused by the refined grain size. A small additional contribution to strengthening is attributed to Orowan strengthening.

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Section: Introductionmentioning

confidence: 99%

Ultrasound Assisted Casting of an AM60 Based Metal Matrix Nanocomposite, Its Properties, and Recyclability

Dieringa

Katsarou

Buzolin

et al. 2017

Metals

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“…Recently, localized creep test methods have been used to evaluate creep behavior of different magnesium alloys. The creep behavior of magnesium alloys has mostly been investigated by indentation tests using spherical indenters [15][16][17] and, in a few cases, by impression techniques. [18,19] The impression creep of AM60 alloy has not been studied previously, and thus, the aim of this study is to investigate creep properties of this alloy using the impression testing technique.…”

Section: Introductionmentioning

confidence: 99%

Impression Creep Characteristics of a Cast Mg Alloy

Kondori

Mahmudi

2009

Metall Mater Trans A

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The creep behavior of the cast Mg-6Al-0.3Mn alloy (AM60) was investigated by impression testing under constant punching stress in the range 150 to 650 MPa and at temperatures in the range 423 to 523 K, corresponding to 0.458 < T/T m < 0.567. The creep behavior can be divided into two stress regimes, with a change from the low-stress regime to the high-stress regime occurring, depending on the testing temperature, around 0.021 < (r/G) < 0.033. Based on the steady-state power-law creep relationship, the stress exponents of 4 to 6 and 8 to 12 were obtained at low and high stresses, respectively. When the experimental creep rates were normalized to the pipe diffusion coefficient, however, the stress exponents of about 5 and 10 were obtained for the low-and high-stress regimes, respectively. The low-stress regime activation energies of about 76 to 84 kJ mol À1 , which are close to 80 kJ mol À1 for dislocation-pipe diffusion in the Mg, and stress exponents in the range 4 to 6 suggest that the operative creep mechanism is dislocation climb. This behavior is in contrast to the high-stress regime, in which the stress exponents of 8 to 12 and activation energies of about 134 to 165 kJ mol À1 are indicative of a power-law breakdown.

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“…The creep behavior of AE42, AE41-Ca, and Mg-Sn alloys has been studied by indentation creep using a spherical indenter under constant load. [18,19] The creep behavior of an Mg-8Zn-4Al-0.5Ca alloy in low stress ranges has also been studied by the constant-stress impression creep test. [20] The impression creep behavior of a cast AZ91 alloy has been investigated and compared with those obtained by the conventional tensile creep testing.…”

Section: Introductionmentioning

confidence: 99%

Effects of Rare Earth Element Additions on the Impression Creep Behavior of AZ91 Magnesium Alloy

Kabirian

Mahmudi

2009

Metall Mater Trans A

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The effects of 1, 2, and 3 wt pct rare earth (RE) element additions on the microstructure and creep behavior of cast AZ91 Mg alloy were investigated by impression tests. The tests were carried out under constant punching stress in the range 200 to 650 MPa at temperatures in the range 425 to 525 K. Analysis of the data showed that for all loads and temperatures, the AZ91-2RE alloy had the lowest creep rates and, thus, the highest creep resistance among all materials tested. This is attributed to the formation of Al 11 RE 3 with a branched morphology, reduction in the volume fraction of the eutectic b-Mg 17 Al 12 phase, and solid solution hardening effects of Al in the Mg matrix. The stress exponents and activation energies were the same for all alloy systems studied, 5.3 to 6.5 and 90 to 120 kJ mol À1 , respectively, with the exception that the activation energy for the AZ91-3RE system was 102 to 126 kJ mol À1 . An observed decreasing trend of creep-activation energy with stress suggests that two parallel mechanisms of lattice and pipe diffusion-controlled dislocation climb are competing. Dislocation climb controlled by dislocation pipe diffusion is controlling at high stresses, whereas climb of edge dislocations is the controlling mechanism at low stresses.

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Indentation creep behavior of AE42 and Ca-containing AE41 alloys

Cited by 25 publications

References 10 publications

Ultrasound Assisted Casting of an AM60 Based Metal Matrix Nanocomposite, Its Properties, and Recyclability

Ultrasound Assisted Casting of an AM60 Based Metal Matrix Nanocomposite, Its Properties, and Recyclability

Impression Creep Characteristics of a Cast Mg Alloy

Effects of Rare Earth Element Additions on the Impression Creep Behavior of AZ91 Magnesium Alloy

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