Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400 °C

Su, Xiaomeng; Yuan, Lei; Chen, Yang; Qu, Hongjie; Zheng, Gong; Liu, Xu; Xiang, Henggao; Chen, Guang

doi:10.1016/j.jmst.2023.06.038

Cited by 16 publications

(1 citation statement)

References 67 publications

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“…Previous studies have been focused on revealing the crystal structure of the T Mn phase (orthorhombic structure with lattice parameters a = 2.42 nm, b = 1.25 nm, and c = 0.775 nm) [20,21] and its interface relationship with the matrix, but few investigations have been emphasized the impact of the T Mn phase on mechanical properties [22][23][24]. The two conspicuous benefits of Mn addition to the Al-Cu-Mg-x Mn alloys are summarized as follows: (i) a multitude of T Mn particles formed during homogenization can impede the movement of dislocations to improve strength [25,26], (ii) the distinct formation temperature between the T Mn and conventional precipitates overcomes the adversity of the synchronous precipitation of dual-strengthening precipitates [17].…”

Section: Introductionmentioning

confidence: 99%

Coupled Precipitation of Dual-Nanoprecipitates to Optimize Microstructural and Mechanical Properties of Cast Al–Cu–Mg–Mn Alloys via Modulating the Mn Contents

Zhang,

Hao,

et al. 2023

Nanomaterials

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The effect of Mn content on the microstructure evolution and mechanical properties of Al–Cu–Mg–x Mn alloys at ambient temperature was investigated. The findings show that in the Mn-containing alloys at the as-cast state, the blocky primary T(Al20Cu2Mn3) phase coexisting with the Al2Cu phase appeared. With the increase in Mn content, the majority of the Al2Cu phase dissolved, nd a minor amount of the T phase remained at the grain boundary after solution treatment. The rod-like TMn (Al20Cu2Mn3) nanoprecipitate was simultaneously distributed at grain boundaries and the interiors, while a high density of needle-like θ″ (Al3Cu) nanoprecipitate was also observed in the T6 state. Further increases in Mn content promoted the dispersion of the TMn phase and inhibited the growth and transformation of the θ″ phase. Tensile test results show that 0.7 wt.% Mn alloy had excellent mechanical properties at ambient temperature with ultimate tensile strength, yield strength, and fracture elongation of 498.7 MPa, 346.2 MPa, and 19.2%, respectively. The subsequent calculation of strengthening mechanisms elucidates that precipitation strengthening is the main reason for the increase in yield strength of Mn-containing alloys.

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