Preferential orientation of precipitates during thermomechanical cyclic loading in an aluminum alloy

Toyoda, Mitsuo; Toda, Hiroyuki; Ikuno, Hajime; Kobayashi, Toshirô; Kobayashi, Masakazu; Matsuda, Kenji

doi:10.1016/j.scriptamat.2006.11.005

Cited by 14 publications

(4 citation statements)

References 9 publications

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“…One is the evolution of precipitation nano‐particles. These nano‐particles were measured by energy dispersive spectrometer (EDS), similar types of intermetallics, and phase morphology were reported in the previous studies . It is noticed from these TEM observations that relatively small Si precipitates at 25 °C (Figure a).…”

Section: Discussionsupporting

confidence: 75%

Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Wang

Pang

et al. 2017

Adv Eng Mater

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The Al-Si piston alloys always bear different temperatures because of its peculiar component structure and service condition. Therefore, the tensile strength, elongation to fracture, and corresponding damage mechanisms of Al12SiCuNiMg piston alloys (ASPA) have been investigated with in situ technique at different temperatures. The tensile properties show two-stage tendencies: the former stage (25-280 C) is determined by easily broken phases with inherent brittleness (such as primary Si), and the fracture behavior presents rapid brittle fracture after reaching the critical stress (about 430 MPa, based on in situ technique and the elastic stress field model). The later one (280-425 C) is dominated by particles debonding and θphase coarsening. The plastic deformation behavior, dynamic recovery, and flow process become more significant on account of thermal activation. The Consid ere criterion h ¼ K indicates that the transition of damage behaviors from insufficient local strength to insufficient matrix strength and the corresponding failure model shifts from brittle to ductile fracture. Based on the damage mechanisms, the elastic field model and thermal activation relation model have been established to characterize the strength of the ASPA at different temperature ranges.

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Section: Discussionsupporting

confidence: 75%

Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Wang

Pang

et al. 2017

Adv Eng Mater

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“…The strongly negative piezoresistivity of the steels, aluminum and PAN-based carbon fiber are attributed to the positive effect of the tensile stress on the degree of preferred orientation. The enhancement of the preferred orientation by tensile stress application has been previously reported for steel [27,28], aluminum [34][35][36][37][38][39][40] and carbon fiber [41].…”

Section: Effect Of Stress On the DC Resistance And Resistivitymentioning

confidence: 82%

Electret, piezoelectret and piezoresistivity discovered in steels, with application to structural self-sensing and structural self-powering

Chung

2019

Smart Mater. Struct.

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Electret, piezoelectret, piezoresistivity and stress-dependent electric permittivity are reported in unmodified steels. Structural stress/strain self-sensing based on piezoelectret/piezoresistivity is demonstrated under tension. Structural self-powering is shown by the electret's inherent electric field, (2.224×10 −5 ) V m −1 and (1.051×10 −5 ) V m −1 , and power density, 29.2 and 41.8 W m −3 , for low carbon steel and stainless steel, respectively, being enabled by the electret's electrical conductivity. The free-electron-movement-enabled electrets are supported by the asymmetry in the polarization-induced apparent resistance relative to the true resistance upon polarity reversal. The electric field increases linearly with the inter-electrode distance l. An l increase causes the amount of participating free electrons to increase and the fraction of free electrons that participate to decrease; when l is tripled, the amount is increased by a factor of 1.011 and 1.021 for low carbon steel and stainless steel, respectively, while the fraction of free electrons that participate is decreased by a corresponding factor of 0.337 and 0.340. The higher values for stainless steel are consistent with the higher relative permittivity (2 kHz), 1.23×10 6 and 2.89×10 6 for low carbon steel and stainless steel, respectively. The capacitance (2 kHz) and electric field (DC) of the piezoelectret decrease nonlinearly with increasing stress, due to electret weakening; the decrease is reversible at stress 210 MPa, but is irreversible at stress 340 MPa (elastic regime). This effect is stronger for low carbon steel than stainless steel. The piezoelectret coupling coefficient d 33 is −(6.6±0.1)×10 −7 and −(3.6±0.2)×10 −7 pC N −1 for low carbon steel and stainless steel, respectively. The relative permittivity (2 kHz) decreases nonlinearly by 14% with stress 340 MPa. The piezoresistivity involves the DC resistivity decreasing nonlinearly and reversibly by 10% with stress 340 MPa; the gage factor is −1030 and −800 for low carbon steel and stainless steel, respectively. The reversibility upon unloading is superior for piezoresistivity than piezoelectret.

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“…As shown in Figure 3 , the maximum tensile and compression stresses for both alloys gradually decreased with the increasing numbers of cycles at all strain amplitudes. This cyclic softening behavior during TMF was likely related to the evolution of the precipitates during the TMF cycling [ 12 , 16 , 18 , 20 , 23 ]. As typical precipitation-strengthening alloys, the precipitates in both alloys play an important role in their mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

“…Toda et al [ 13 ] reported that precipitates preferentially oriented perpendicular to the loading direction can effectively prolong the in-phase TMF life, but the study did not comment on the OP-TMF life. Toyoda et al [ 20 ] investigated the microstructural change in an Al-Si-Cu-Mg cast alloy under thermo-mechanical loading conditions and reported that the precipitates were observed to align perpendicularly to the compressive stress during heating, but they did not further discuss how these precipitates with preferential orientations affected the TMF behavior. Therefore, the systematic evolution of precipitates during TMF under various strain amplitudes, which is one of the significant factors influencing the TMF resistance, is still not well-documented in Al-Si cast alloys.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Mechanical Fatigue Behavior and Resultant Microstructure Evolution in Al-Si 319 and 356 Cast Alloys

et al. 2023

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The out-of-phase thermo-mechanical fatigue (TMF) behavior of the two Al-Si cast alloys most widely used for engine applications (319 and 356) were investigated under temperature cycling (60–300 °C) and various strain amplitudes (0.1–0.6%). The relationship between the microstructural evolution and TMF behavior was closely studied. Both alloys exhibited asymmetric hysteresis loops with a higher portion in the tensile mode during TMF cycling. The two alloys showed cyclic softening behavior with regard to the maximum stress, but an earlier inflection of cyclic stress was found in the 356 alloy. The TMF lifetime of the 319 alloy was generally longer than that of the 356 alloy, especially at higher strain amplitudes. All the precipitates (β′-MgSi in 356 and θ′-Al2Cu in 319) coarsened during the TMF tests; however, the coarsening rate per cycle in the 356 alloy was significantly higher than that in the 319 alloy. An energy-based model was applied to predict the fatigue lifetime, which corresponded well with the experimental data. However, the parameters in the model varied with the alloys, and the 356 alloy exhibited a lower fatigue damage capacity and a higher fatigue damage exponent.

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Preferential orientation of precipitates during thermomechanical cyclic loading in an aluminum alloy

Cited by 14 publications

References 9 publications

Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Tensile Strength Evolution and Damage Mechanisms of Al–Si Piston Alloy at Different Temperatures

Electret, piezoelectret and piezoresistivity discovered in steels, with application to structural self-sensing and structural self-powering

Thermo-Mechanical Fatigue Behavior and Resultant Microstructure Evolution in Al-Si 319 and 356 Cast Alloys

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