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Effect of mole ratio of Y to Zn on phase constituent of Mg-Zn-Zr-Y alloys

Transactions of Nonferrous Metals Society of China 2011年第4期21卷 795-800页

作者：罗素琴汤爱涛潘复生宋锴王维青重庆大学材料科学与工程学院重庆400030 重庆大学国家镁合金工程技术研究中心重庆400030

The phase constituent evolution of Mg-Zn-Y-Zr alloys with the mole ratio of Y to Zn both in the as-cast and as-annealed states at the Mg-rich corner was investigated by XRD and SEM/EDS analysis and was further explained from the ternary phase diagram calculation. The results show that the formation of the secondary phases in Mg-Zn-Y-Zr alloys firmly depends on the mole ratio of Y to Zn, and X （Mg 12 YZn）-phase, W （Mg 3 Y 2 Zn 3 ）-phase and I （Mg 3 YZn 6 ）-phase come out in sequence as the ratio of Y to Zn decreases. The mole ratios of Y to Zn with the corresponding phase constituent are suggested quantitatively as follows： the phase constituent is α-Mg ＋ I when the mole ratio of Y to Zn is about 0.164; α-Mg ＋ I ＋W when the mole ratio of Y to Zn is in the range of 0.164 0.33;α-Mg ＋W when the mole ratio of Y to Zn is about 0.33; α-Mg ＋W＋X when the mole ratio of Y to Zn is in the range of 0.33 1.32; and α-Mg ＋X when the mole ratio of Y to Zn is about 1.32. The results also offer a guideline for alloy selection and alloy design in Mg-Zn-Y-Zr system.

关键词： magnesium alloy Mg-Zn-Zr-Y mole ratio phase constituent

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Effects of annealing at 800 and 1000℃ on phase precipitates and hardness of Al_(7)Cr_(20)Fe_(x)Ni_(73)−x alloys

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Transactions of Nonferrous Metals Society of China 2021年第3期31卷 734-743页

作者： Chang-jun WU Chen ZHOU Jiao-feng ZENG Ya LIU Hao TU Xu-ping SU Jiangsu Key Laboratory of Materials Surface Science and Technology School of Materials Science and EngineeringChangzhou UniversityChangzhou 213164China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou UniversityChangzhou 213164China

The effects of Fe content on the microstructure,phase constituents and microhardness of the as-cast,800℃or 1000℃-annealed Al_(7)Cr_(20)Fe_(x)Ni_(73)−x(x=13−66)alloys were *** all these alloys are composed of the single FCC *** BCC and B2 phases are *** is confirmed that the BCC phase in the Al7Cr20Fe66Ni7 alloy is transformed from the FCC phase at about 900℃ during *** in the 800℃-annealed Al7Cr20Fe60Ni13 alloy,the FCC phase is stable and the hardness *** annealing at 1000℃,for the precipitation of the B2 particles,the Al content in the FCC phase decreases,which results in decreasing of the alloy ***,after annealing at 800℃,a small amount of Al-rich B2 particles precipitate at the phase boundary and some nanocrystal BCC phase precipitates in the FCC matrix,which increases the hardness of the Al_(7)Cr_(20)Fe_(x)Ni_(73)−x(x=41−49)*** results will help to the composition design and processing design of the Al−Cr−Fe−Ni based high-entropy alloys.

关键词： high-entropy alloy Al−Cr−Fe−Ni phase constituent microhardness heat treatment

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