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- 저자 : Yaoxiang Geng (검색결과 3 건)
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Yaoxiang Geng,Yingmin Wang,Yuxin Wang,Zhijie Zhang,Hongbo Ju,Lihua Yu,Junhua Xu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
The effects of minor alloying addition of Cu on the glass-forming ability and crystallization process of Fe71.7−xB16.7Si8.3Zr3.3Cuxand Fe72.5−xB16.7Si8.3Hf2.5Cux (x = 0, 0.3, 0.7, 1.0 and 1.3; at%) alloys were investigated. It was found that the critical glassformation size of rod samples gradually decreased from 2.5 to 1 mm with increasing Cu content in these alloys. Single α-Fe phase nanocrystalline alloys were obtained after isothermal annealing the Fe–B–Si–Zr/Hf–Cu glassy alloys containing0.7–1.0 at% Cu. The Fe71B16.7Si8.3Zr3.3Cu0.7alloy exhibited good soft magnetic properties with a high saturation magnetization(~ 1.22 T) and a low coercive force (~ 0.6 A/m) after annealing at 853 K for 10 min due to the precipitation of α-Fenanoparticles of 8 nm size in the glassy matrix. The structural evolution on annealing and the variation tendencies against Cucontent of the glass transition temperature, thermal stability and glass-forming ability of the Fe–B–Si–Zr/Hf–Cu amorphousalloys were discussed using a dual-cluster local structure model.
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Mechanical Properties of High Mg-Content Al-Mg-Sc-Zr Alloy Fabricated by Selective Laser Melting
Hao Tang,Yaoxiang Geng,Jinjie Luo,Junhua Xu,Hongbo Ju,Lihua Yu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
The efects of process parameters and aging treatment on the microstructure and mechanical properties of selective lasermelting (SLM) fabricated high Mg-content Al-Mg-Sc-Zr aluminum alloy were systematically studied. Our experiment resultsshow that the samples exhibit good processability with porosity less than 1%. The increase of Mg content in Al-Mg-Sc-Zris benefcial to reduce the texture of the alloy. The laser scanning speed has a large infuence on the Vickers hardness ofas-fabricated samples. The maximum microhardness of as-fabricated sample reaches 148±2 HV with a compression yieldstrength of 342±7 MPa. After aging treatment, the distinction in microhardness of the samples obtained under diferent laserscanning speed is obviously reduced, and the mechanical properties of the samples are further improved with a maximummicrohardness of 175±5 HV and a maximum compressive yield strength of 476±10 MPa, which are superior to the knownAl-Mg-Sc-Zr alloy with same Sc and Zr content fabricated by SLM. In this study, a novel high Mg-content Al-Mg-Sc-Zraluminum alloy specifcally for SLM with good processability and mechanical properties was reported.
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Jiang Yu,Yaoxiang Geng,Zhijie Zhang,Hongbo Ju 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
To address the high cost of raw materials for laser powder bed fusion (L-PBF) processed high-performance Al-Mn-Mg-Sc-Zr alloy, a novel Er- and Zr-modified Al-Mn-Mg alloy was fabricated by L-PBF using pre-alloyed powder in this study. The large internal stress and the existence of the keyhole together caused cracks in most of the L-PBF processed samples. The as-built sample exhibited a heterogeneous grain structure, including main columnar α-Al grains in the inner region ofthe molten pool and a few ultrafine α-Al equiaxed grains at the fusion boundary. Al3Ernanoparticles were attached to theAl6Mnphase, and both mainly precipitated at the grain boundary of α-Al. The existence of Mn in the alloy reduced thegrain refining effect of Er elements. The yield strength (YS), ultimate tensile strength (UTS) and elongation of the as-builtalloy were 327 ± 5 MPa, 502 ± 3 MPa, and 12.2 ± 1% respectively. When the aging temperature was over 350 ℃, the primaryprecipitates in the sample grew up, and needle-shaped secondary Al6Mnnanoparticles precipitated from α-Al. 350 ℃-6 haging alloy exhibited maximum Vickers hardness of 171 ± 1 HV with YS, UTS and elongation of 339 ± 2 MPa, 508 ± 1 MPaand 8.1 ± 1%, respectively. During the tensile process of the alloy, micro-cracks mainly originated from the fusion boundary. At last, the authors also shared some prospects for future work.
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