The Influence of Cu Addition on Dispersoid Formation and Mechanical Properties of Al-Mn-Mg 3004 Alloy

Li, Zhen; Zhang, Zhan; Chen, X.-Grant

doi:10.3390/met8030155

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…In Cr-free DC0 alloys, the dispersoids could be identified as ¡-Al(Mn, Fe) Si dispersoids based on the shape and composition, which agreed with many previous works. 13,5,8) However, in DC30 alloys, a small amount of Cr element were detected in the dispersoids according to the EDS spectrum results as shown in Fig. 5.…”

Section: Dispersoidsmentioning

confidence: 93%

“…12) Cu decreased the size of dispersoids and improved dispersoids' thermal stability. 13) The addition of Sc and Zr could greatly increase yield strength at room temperature and creep resistance at elevated temperature by introducing Al 3 (Sc, Zr) into AA3xxx alloys. 14) With the addition of Mo, the size of dispersoids became finer with a higher volume fraction, the area percentage of dispersoid free zones was reduced.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cr Addition on Microstructure and Mechanical Properties at Elevated Temperature of Al–Mn–Mg–Si Alloys

Qin

Zhang

et al. 2020

Mater. Trans.

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Recently, the remarkable strengthening effect of ¡-Al(Mn, Fe) Si dispersoids at both ambient temperature and elevated temperature were found by several researches. In AA3xxx alloys, a large amount of dispersoids can form by applying suitable heat-treatment. In the present work, the influences of Cr addition on mechanical properties and microstructures of the AlMnMgSi alloys were investigated. The mechanical properties at ambient temperature were evaluated by micro-hardness and yield strength. Yield strength at 300°C and creep resistance at 300°C were used to evaluate materials' mechanical properties at elevated temperature. Moreover, the microstructures in as-cast and heat-treated conditions were quantitatively analyzed by optical and transmission electron microscopes. Results revealed that the addition of Cr increased area percentage of Mn-containing intermetallic particles. It also indicated that solubility of Mn element decreased due to Cr addition. Very little amount of Cr were detected in Mn-containing intermetallic particles and dispersoids. The distribution of dispersoids was not influenced by Cr addition. Number density and volume fraction of dispersoids decreased because of Cr. Electrical conductivity decreased significantly because of 0.30% Cr addition which indicated that a large amount of Cr were still in solid solution condition. Micro-hardness and yield strength at ambient temperature increased with the increasing content of Cr, and the Cr addition increased yield strength at elevated temperature as well. Moreover, creep resistance at 300°C improved dramatically with the increasing content of Cr.

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Section: Dispersoidsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effect of Cr Addition on Microstructure and Mechanical Properties at Elevated Temperature of Al–Mn–Mg–Si Alloys

Qin

Zhang

et al. 2020

Mater. Trans.

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“…Liu and Chen optimized the content of Fe and Mn in Al-Mn-Mg for dispersion hardening [9,10]. The effect of Mg, Mo and Cu additions on the precipitation of Mn-rich dispersoids during the heat treatment of as-cast Al-Mn alloys has also been investigated [11][12][13]. A large quantity of uniformly distributed dispersoids are optimum for dispersion hardening.…”

Section: Introductionmentioning

confidence: 99%

Improving Elevated-Temperature Strength of an Al–Mn–Si Alloy by Strain-Induced Precipitation

Zhang¹,

Jin²,

Hao³

et al. 2018

Metals

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Abstract:The coupled effect of strain-induced precipitation and stabilized substructure on the elevated-temperature strength of an Al-Mn-Si alloy and its thermal stability have been investigated. Prestrain significantly promotes the nucleation of nano-sized dispersoids, and strain-induced precipitation suppresses recrystallization, stabilizing substructure at elevated temperatures. Compared with the dispersoids formed during the heat treatment of as-cast alloy, substructure does not increase the coarsening rate of strain-induced precipitates. The strain-induced precipitation and stabilized substructure profoundly strengthen the aluminum alloy at the elevated temperature (300 • C).

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Microstructural Refinement and α‐Dispersoid Evolution in Direct‐Chill Cast Al–Mg–Si–Fe Alloy

et al. 2020

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In the industrial production of 6xxx alloys, direct chill (DC) casting is primarily used due to its low cost and high levels of production. However, in conventional DC casting, the 6xxx alloy billet typically has coarse grains and exhibits microstructural inhomogeneity, particularly coarse Fe-containing intermetallics, because of low cooling rate and high Fe impurity. [1-3] To solve these problems, previous work has reported that increasing casting speed (withdrawal speed of billet during DC casting) refined the microstructure and improved the quality of aluminum alloy billets due to increased cooling rates and improved melt flow. [4,5] However, these improvements are limited even if the casting speed rises to 200 mm min À1[4,5] because the cooling rate is limited to 30-40 K s À1. Moreover, Fe acts as a common impurity, forming coarse and brittle Fe-containing intermetallics when Fe levels are higher than 0.2%. Mn addition, [6] severe plastic deformation, [7] melt shearing, [8] and spray forming [9] can relieve its adverse effects, but complexity and high costs restrict their practicality for the industrial production of aluminum alloys. If Fe-containing intermetallics can be effectively refined during DC casting, its adverse effects can be relieved inexpensively in the 6xxx alloy with high Fe levels. However, conventional DC casting cannot effectively refine the Fe-containing intermetallic. [10,11] Therefore, further increases in casting speed and cooling rate are essential for the refinement of Fe-containing intermetallics, grain structures, and improved microstructural inhomogeneity in the industrially produced 6xxx alloy. Until now, the effects of higher casting speed (300 mm min À1) on the grain structure, Fe-containing intermetallics, and microstructural inhomogeneity of 6xxx alloy billets have rarely been investigated. On the contrary, α-dispersoids precipitated during homogenization can obstruct the dislocation motion and control the recrystallization, further improving fatigue strength in deformed 6xxx alloys. [12-14] However, the α-dispersoids are coarse and lower in density in 6xxx alloy billets subjected to conventional casting, suppressing the advantages of α-dispersoids in alloy deformation. [15,16] Current studies focus on the decrease in size and homogeneity of α-dispersoids by changing the heat treatment conditions and alloy composition. [17-19] Regardless, inadequate attention is paid to the effects of as-cast microstructural evolution on the size, morphology, and number density of α-dispersoids. Meanwhile, the air-cooling process after homogenization is considered for the investigation of precipitation behavior of the alloy in industrial production.

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The Influence of Cu Addition on Dispersoid Formation and Mechanical Properties of Al-Mn-Mg 3004 Alloy

Cited by 10 publications

References 24 publications

Effect of Cr Addition on Microstructure and Mechanical Properties at Elevated Temperature of Al–Mn–Mg–Si Alloys

Effect of Cr Addition on Microstructure and Mechanical Properties at Elevated Temperature of Al–Mn–Mg–Si Alloys

Improving Elevated-Temperature Strength of an Al–Mn–Si Alloy by Strain-Induced Precipitation

Microstructural Refinement and α‐Dispersoid Evolution in Direct‐Chill Cast Al–Mg–Si–Fe Alloy

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