Effect of Q-Al 5 Cu 2 Mg 8 Si 6 phase on mechanical properties of Al-Si-Cu-Mg alloy at elevated temperature

Zuo, Liang; Yan, Bing; Feng, Jian; Kong, Xiangyang; Jiang, Haiyan; Ding, Wei

doi:10.1016/j.msea.2017.03.087

Cited by 58 publications

(23 citation statements)

References 35 publications

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“…Al7Si2Cu0.2Zr alloy at elevated temperatures is governed by the formation of precipitates containing Zr element. Moreover, the formation of Q´ phase by tuning the Cu content can significantly increase the resistance of the alloy at elevated temperatures[61].…”

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confidence: 99%

Nanoscale Zr-containing precipitates; a solution for significant improvement of high-temperature strength in Al-Si-Cu-Mg alloys

Rahimian

Amirkhanlou

Blake

et al. 2018

Materials Science and Engineering: A

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This work aims to reveal the valuable role of Zr in cast Al-Si-Cu-Mg alloys utilised at elevated temperatures. The Al7Si2Cu0.2Zr alloy, subjected to well-tuned heat treatment process, was benchmarked against the conventional Al7Si0.5Cu alloy. Microstructural investigation showed that the main strengthening phases in the Al7Si2Cu0.2Zr alloy are θ´, Q´, Al-Si-Cu-Zr and Al-Si-Zr precipitates. Two Zr-containing precipitates (Al-Si-Cu-Zr and Al-Si-Zr) with the size of 80-200 nm are formed during solutionising at530 °C, which can be considered as the first ageing step. Other two Cu-containing precipitates (θ´and Q´) at the size of 20 nm are formed during ageing (170 °C). Nano-sized Zr-containing precipitates are mostly exhibited elliptical morphology with coherent/semi-coherent interfaces with the α-Al matrix, making them more stable at elevated temperatures. As a result, the yield strength is improved at room temperature from 261 to 291 MPa, and the ultimate tensile strength (UTS) is improved from 282 to 335 MPa for the Al7Si2Cu0.2Zr alloy, compared with the Al7Si0.5Cu alloy. Moreover, the mechanical properties are significantly improved at elevated temperatures. The yield strength and UTS at 200 °C are 177 and 186 MPa, respectively, for the Al7Si0.5Cu alloy. But these are224 and 246 MPa, respectively, for the Al7Si2Cu0.2Zr 2 alloy. The improvement of mechanical properties at elevated temperatures is mainly attributed to the refined microstructure and the precipitation of strengthening phases containing slow-diffused Zr element to retard the precipitation coarsening. Furthermore, the addition of Cu changes the precipitates from θ´ and β´´ in the Al7Si0.5Cu alloy to θ´ and Q´ in the Al7Si2Cu0.2Zr alloy which, in turn, induce a complementary effect on the improvement of mechanical properties.

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confidence: 99%

Nanoscale Zr-containing precipitates; a solution for significant improvement of high-temperature strength in Al-Si-Cu-Mg alloys

Rahimian

Amirkhanlou

Blake

et al. 2018

Materials Science and Engineering: A

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“…Based on the SEM/EDS scanning results of Cu and Mg atoms in Section 3.3, the reason for this phenomenon is that the Cu and Mg atomic groups in Al-Si-Cu-Mg alloy have been dissolved and homogenized at 520 °C, and the main strengthening phases, Al2Cu phase (3#,4#), and Q-Al5Cu2Mg8Si6 phase (5#) have been dissolved, so the tensile properties of the alloy will be improved. The melting point of the Al2Cu phase is 523 °C, and the melting point of the Q-Al5Cu2Mg8Si6 phase is 533 °C; therefore, when the alloy is kept at a temperature higher than this temperature for a long time, the traditional microstructure which can improve the tensile properties at room temperature has almost completely dissolved, which can not hinder the migration of dislocation [16], and the tensile properties of BA alloy decrease sharply. The intermetallic phases, such as the rich CrVTi phase, rich TiVMo phase, rich MnMoFe phase, and rich TiVZr phase contained in MA, can exist stably and do not dissolve at high temperatures; these intermetallic phases are pinned at the grain boundary, so the diffusion deformation of the grain boundary can be hindered to a certain extent, thus preventing the generation of microcracks.…”

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Effect of Transition Metal Elements on High-Temperature Properties of Al–Si–Cu–Mg Alloys

Gao

Zhang

2021

Metals

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In the present work, we studied the effects of transition metal elements on microstructure evolution and high-temperature mechanical properties via the preparation of new modified alloys with micro-additions of Cr, Ti, V, Zr, Mo, and Mn to address the poor high-temperature performance of Al–Si–Cu–Mg alloys for automotive engines. The results show that the addition of transition metal elements formed a variety of new intermetallic phases that were stable at high temperatures, such as (AlSi)3(TiVZr), (AlSi)3Ti, (AlSi)3(CrVTi), Al74Si6Mn4Cr2Fe, Al85Si5Mn2Mo2CrFe, Al0.78Fe4.8Mn0.27Mo4.15Si2, (AlSi)2(CrVTi)Mo, and Al13(MoCrVTi)4Si4, and these phases evidently improved the ultimate high-temperature tensile strength and yield strength. The ultimate tensile strength and yield strength of the modified alloy increased by 17.49% and 31.65% when the test temperature increased to 240 °C, respectively, and by 71.28% and 74.73% when the test temperature increased to 300 °C, respectively. The fundamental reason for this change is that the intermetallic phase hinders the expansion of cracks, which can exist stably at high temperatures. When a crack extends to the intermetallic phases, it will break along with the intermetallic phases or propagate along the morphological edge of the intermetallic phases.

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“…Результаты исследований и их обсуждение. В сплаве 6013 системы Al-Mg-Si-Cu выделяются две равновесные фазы: кубическая  (Mg2Si) − фазы (пространственная группа Fm3m типа CaF2 с периодом решетки а = 0,639 нм) и гексагональная Q (Al5Cu2Mg8Si6) − фаза с периодами решетки а = 1,032 нм; с = 0,405 нм) [14][15][16]. В работе [17] методами дифференциальной сканирующей калориметрии, просвечивающей электронной микроскопии, рентгеноструктурного анализа [18] построена диаграмма фазовых превращений при старении сплава 6013, на которой нанесены области существования фаз βи Qтипа (рис.1).…”

Section: список литературыunclassified

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2019

BSTD

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All amphibious all-terrain vehicle components including its chassis are subjected to harsh vibrations during driving. Тhis paper explores the system of newly patented Vibration Energy Harvesting Dampers for mitigation of such vibrations is used because it could provide mutually interconnected results: reduction of undesired vibration levels and generating of additional electrical power. The examples of their installations into driveline and chassis structures are studied.

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Effect of Q-Al 5 Cu 2 Mg 8 Si 6 phase on mechanical properties of Al-Si-Cu-Mg alloy at elevated temperature

Cited by 58 publications

References 35 publications

Nanoscale Zr-containing precipitates; a solution for significant improvement of high-temperature strength in Al-Si-Cu-Mg alloys

Nanoscale Zr-containing precipitates; a solution for significant improvement of high-temperature strength in Al-Si-Cu-Mg alloys

Effect of Transition Metal Elements on High-Temperature Properties of Al–Si–Cu–Mg Alloys

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