Effect of pre-strain and two-step aging on microstructure and stress corrosion cracking of 7050 alloy

Wang, D.; Ni, D.R.; Ma, Z.Y.

doi:10.1016/j.msea.2008.04.023

Cited by 130 publications

(43 citation statements)

References 25 publications

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“…The homogeneous and heterogeneous distributions of strain are also apparent in the plots shown in Figure 4d-f, where homogeneous straining for 5% and 10% was demonstrated along the gauge lengths and thicknesses, but the non-uniform distribution of strain was observed at the different sections in the sample gauge after strain for 15% at RT. Thus, the results demonstrated a limitation of pre-straining for up to 10% at RT in the present experimental conditions and, more importantly, this limitation in the amount of attainable strain restricts any potential of RT pre-straining for the development of forming techniques, such as bake hardening [14,20] and double thermomechanical treatment [21] of Al 7075 alloy. after strain for 15% at RT.…”

Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 71%

“…after strain for 15% at RT. Thus, the results demonstrated a limitation of pre-straining for up to 10% at RT in the present experimental conditions and, more importantly, this limitation in the amount of attainable strain restricts any potential of RT pre-straining for the development of forming techniques, such as bake hardening [14,20] and double thermomechanical treatment [21] of Al 7075 alloy.…”

Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 71%

“…Importance of pre-straining before aging was demonstrated by Wang et al where the combination of pre-straining with a two-step aging process improved both the strength and stress corrosion cracking resistance of an Al 7050 alloy [14]. Moreover, both bake-hardening and maximum yield strength was improved by an increasing amount of pre-strain up to 6% before a baking/aging treatment on an Al 7075 alloy [15] and the result is consistent with the baking behavior after prestraining of an Al-Mg-Si alloy [16].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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Abstract:The present study investigates the significance of pre-strain on the T6 aging behavior of an Al 7075 alloy for evaluating the applicability of hot stamping. In practice, the alloy was pre-strained up to 15% during solution heat treatment at 480 • C prior to quenching, and artificial aging was conducted at 120 • C. The peak aging time and precipitation behavior were compared with the alloy with pre-straining at room temperature after quenching but immediately before the artificial aging. The results showed that increasing amounts of pre-strain tend to reduce the aging time up to 50% for achieving peak hardness, which is consistent with the alloy at the T6 condition. There is a limitation for the maximum attainable amount of pre-strain of 10% for the homogeneous distribution of strain when the alloy is strained at room temperature (RT) due to the low formability. The pre-strained alloy as hot stamping exhibited lowering of the peak reaction temperatures for dissolution and formation of Guinier-Preston (GP)-Zones and precipitated with increasing amounts of pre-strain towards 15% through the differential scanning calorimetry analysis, thereby confirming the shortening of the peak aging time. The present study confirms the excellent potential of the hot-stamping process to extend the capability of an Al 7075 alloy.

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Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 71%

Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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“…Phase η' was transformed to phase η on iv stage. Above 250°c, which correspond to stage v, phase η increase, what contributed to decrease their coherence with matrix [20]. The results showed that increase of strain grade caused intensification of precipitation processes.…”

Section: Resultsmentioning

confidence: 87%

“…The bright precipitates showed the presence of Al, cu, fe, which probably were particles of Al 7 Cu 2 Fe [19]. The dark precipitates contained in their chemical composition Al, Mg, si, and low level of zn and probably were particles of Mg 2 Si [20]. Calorimetric analysis samples were prepared so that the weight was similar to 50 mg. Then heated up at a rate of 5°C/ min to temperature 300°C.…”

Section: Resultsmentioning

confidence: 99%

Influence of Degree of Deformation and Aging Time on Mechanical Properties and Microstructure of Aluminium Alloy with Zinc / Wpływ Stopnia Odkształcenia I Czasu Starzenia Na Właściwośi Mechaniczne I Mikrostrukturę Stopu Aluminium Z Cynkiem

Jarzębska¹,

Bogucki²,

Bieda³

2015

Archives of Metallurgy and Materials

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In order to investigate the influence of the deformation degree and aging time on the mechanical properties and microstructure of AA7050 alloy static tensile test, microhardness measurements, calorimetric analysis and observations of the microstructure in the transmission and scanning electron microscope were carried out. For study a series of cylindrical specimens with an initial diameter of about 3 mm were used. The samples were saturated at a temperature of 470° C for 1 hour and quenched in water. The samples were then subjected to deformation up to the three levels: 0%, 5% and 10%. Deformed samples was artificially aged at 120°C for 6 hours, 12 hours, 24 hours and 72 hours. The results showed that the increase in the degree of deformation caused an increase in yield strength and a decrease in ductility. The longer aging time influenced on an increase in tensile strength, yield stress and microhardness and a decrease in ductility. An analysis of the precipitates present in the material was conducted. The highest value of yield strength equal 538 MPa with elongation 9.2% were obtained for sample pre-strained to 10% and aged for 24 hours. The obtained results showed that prolongation in aging time and use of pre-strain were beneficial for precipitation processes courses, consequently, for optimal mechanical properties of alloy 7050.

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Effect of Strain‐Induced Precipitation on Microstructures and Fatigue Properties of AA 7050 Alloy

Lang¹,

Hou²,

Huo³

et al. 2013

Pricm

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Effect of pre-strain and two-step aging on microstructure and stress corrosion cracking of 7050 alloy

Cited by 130 publications

References 25 publications

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Influence of Degree of Deformation and Aging Time on Mechanical Properties and Microstructure of Aluminium Alloy with Zinc / Wpływ Stopnia Odkształcenia I Czasu Starzenia Na Właściwośi Mechaniczne I Mikrostrukturę Stopu Aluminium Z Cynkiem

Effect of Strain‐Induced Precipitation on Microstructures and Fatigue Properties of AA 7050 Alloy

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