Indentation creep in a short fibre-reinforced metal matrix composite

Cseh, G.; Bär, Jürgen; Gudladt, H.‐J.; Lendvai, J.; Juhász, András

doi:10.1016/s0921-5093(99)00466-9

Cited by 67 publications

(32 citation statements)

References 8 publications

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“…From figure 5(b), the average value of the activation energy is found to be 114kJ/mol. Since the activation energy for self-diffusion in pure Aluminum was reported as142 kJ/mol [9], the activation energy obtained in the present investigation lies close to this value. Therefore one can conclude that the steady state creep in the present alloy is controlled by climb of edge dislocations.…”

Section: Resultssupporting

confidence: 85%

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

Das

Robi

Sankar

2018

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

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Abstract. The present study is aimed at evaluating the creep behavior of the nugget zone of friction welded 2014 Aluminum alloy by indentation creep tests. Impression creep testing was carried out at different temperatures of 300ºC, 350ºC and 400 ºC with stress124.77MPa, 187.16MPa, 249.55 MPa using a 1.0 mm diameter WC indenter. Experiments were conducted till the curve enters the steady state creep region. Constitutive modeling of creep behavior was carried out considering the temperature, stress and steady state creep rate. Microstructural investigation of the crept specimen at 400ºC temperature and 187.16 MPa load was carried out and found that the small precipitates accumulate along the grain boundaries at the favorable conditions of the creep temperature and stress, new precipitates evolve due to the ageing. The grains are broken and deformed due to the creep phenomena.

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Section: Resultssupporting

confidence: 85%

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

Das

Robi

Sankar

2018

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

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“…[10][11][12] There have been many attempts to investigate the possibility of gaining information on creep properties by the use of impression tests. [14][15][16] Impression creep is a quick, cheap, and effective way of determining creep properties of materials. This test involves applying a constant load to a flat-ended cylindrical punch and recording variations of penetration depth of the indenter as a function of time, from which the penetration rate or impression velocity can be obtained.…”

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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“…According to the power-law creep, a decrease in stress exponent would result in an increase in creep rate due to a decrease in yield strength. 27,29 Therefore, the HW material with significantly lower n values is less resistant to indentation creep compared to the other conditions, which all exhibited almost similar behavior, as shown by their n values of about 12. The same result can also be extracted from the indentation curves shown in Figs.…”

Section: Resultsmentioning

confidence: 93%

Room-temperature indentation creep of lead-free Sn-5%Sb solder alloy

Geranmayeh

Mahmudi

2005

Journal of Elec Materi

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Creep behavior of the lead-free Sn-5%Sb solder alloy was studied by long-time Vickers indentation testing at room temperature. Four different conditions of the material were examined. These were unhomogenized cast (UC), homogenized cast (HC), unhomogenized wrought (UW), and homogenized wrought (HW) conditions. Based on the steady-state power-law creep relationship, the stress exponents were determined through different methods of analysis, and in all cases, the calculated exponents were in good agreement. The stress exponent values of about 5 and 12, depending on the processing route of the material, are very close to those determined by room-temperature conventional creep testing of the same material reported in the literature. For the HW condition, the n value of about 5 together with a very fine grain size of 4.5 µm and a high volume fraction of second-phase particles of 8.6% may suggest that dislocation climb is the creep mechanism. For all other conditions with different grain sizes and second-phase volume fractions, however, the high n value of 12 implies that the operative creep mechanism is dislocation creep, which is independent of grain size.

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Indentation creep in a short fibre-reinforced metal matrix composite

Cited by 67 publications

References 8 publications

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

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

Room-temperature indentation creep of lead-free Sn-5%Sb solder alloy

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