The structure determination of Al20Cu2Mn3 by near atomic resolution chemical mapping

Shen, Zhenju; Liu, Chunhui; Ding, Qingqing; Wang, Shuangbao; Wei, Xiao; Chen, Lu; Li, Jixue; Zhang, Ze

doi:10.1016/j.jallcom.2014.02.125

Cited by 73 publications

(23 citation statements)

References 38 publications

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“…The T-phase was first described by Robinson [12]. In the literature, it is also known as T-Al 20 Mn 3 Cu 2 [13]. However, this phase was also denoted as τ 1 -Al 29 Mn 6 Cu 4 [10,14] and Al 21 Mn 3 Cu 2 [15].…”

Section: As-cast Microstructurementioning

confidence: 99%

Precipitates in a quasicrystal-strengthened Al–Mn–Be–Cu alloy

Zupanič¹,

Wang²,

Gspan³

et al. 2015

Materials Characterization

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Section: As-cast Microstructurementioning

confidence: 99%

Precipitates in a quasicrystal-strengthened Al–Mn–Be–Cu alloy

Zupanič¹,

Wang²,

Gspan³

et al. 2015

Materials Characterization

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“…Figure 3 shows the TEM images and EDS results of the precipitates in the studied alloys as-solutionized and SAD patterns of representative precipitation particles. TEM images exhibit that most of them take a shape of the rod, long or short in size, consistent with [9][10][11]18]. Usually, the composition detected by TEM-EDS is much more accurate than that by SEM-EDS.…”

Section: Methodsmentioning

confidence: 73%

“…%, TEM-EDS result indicates the precipitation particles are Al-Cu-Mn compound with a Cu/Mn atomic ratio close to 2 : 3 ( Figure 3(b)). Feng et al [9], Shen et al [10], and Chen et al [11] thought the rod-like particles precipitated in the solutionized 2 × 24 alloy and Al-5Cu-1Mn alloy are T Mn phase with a formula of Al 20 in the Cu-rich corner, the most possible phase of Al-Cu-Mn compounds is T Mn . us, the precipitates in the A 1 alloy are thought to be the T Mn phase.…”

Section: Methodsmentioning

confidence: 99%

“…For 2 × 24 alloys, the interaction between the dislocation motion and dispersoid precipitates of T Mn (Al 20 Cu 2 Mn 3 ) and θ (CuAl 2 ) phases play key roles in strengthening at high temperature [5][6][7][8]. For the 2 × 24 alloys (Al-Cu-Mg-Mn alloys), large amounts of rod-like T-phase (Al 20 Cu 2 Mn 3 ) dispersoid particles are precipitated in ingot homogenization or solution treatment processes [9,10]. Chen et al [11] reported that the overwhelming majority of particles of the T Mn phase take a shape of a rod in the Al-5Cu-1Mn alloy after solutionizing.…”

Section: Introductionmentioning

confidence: 99%

“…Using CBED (convergent beam electron diffraction), Park and Kim [14] determined the structure parameters of the T Mn phase of a � 2.345 nm, b � 1.183 nm, and c � 0.729 nm. Recently, Shen et al [10] proposed that the T Mn phase belongs to a space group of BBMM (Brownian bridge movement model) with lattice parameters of a � 23.98Å…”

Section: Introductionmentioning

confidence: 99%

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Uneven Precipitation Behavior during the Solutionizing Course of Al‐Cu‐Mn Alloys and Their Contribution to High Temperature Strength

Chen

Liao

2018

Advances in Materials Science and Engineering

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e dispersoid precipitation behavior during the solutionizing and aging of Al-xwt.%Cu-1.0 wt.% Mn alloys (x � 2.0, 4.5, and 7.5) and contribution to mechanical properties were investigated using tensile testing and microstructural characterization. A shell-core structure of primary α-Al dendrites is found in Al-Cu-Mn alloys, in which the Cu content in the shell is higher than that in the core. e area of shell zone (Cu-rich) increases with an increase in Cu content in the alloy. Large amounts of fine dispersoid Al-Cu-Mn particles precipitate in solution. An alloy with low Cu content results in only the T Mn (Al 20 Cu 2 Mn 3 ) particles being precipitated. However, in an alloy with high Cu content, AlCu 3 Mn 2 particles are first found to precipitate beside T Mn . However, this precipitation behavior is uneven. e precipitation zones in the solution microstructure are consistent with the Cu-rich regions in the as-cast microstructure. A number of fine particles (dozens nanometer in size) are first found to precipitate on the rod-like T Mn particles during the aging phase. e redissolution and granulation of the eutectic CuAl 2 phase during the solutionizing process result in the formation of particle-free bands between the precipitation zones. e tension test at 300°C demonstrates that the increase in high temperature strength is due to the dispersoid precipitation during solutionizing, and the precipitation behavior in the aging phase has little or no effect, however, largely improves the tensile strength at room temperature. High temperature strength is significantly increased with an increase in Cu content, which correlates to an increase in number and decrease in size of T Mn and AlCu 3 Mn 2 particles.

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