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Journal of Materials Science & Technology 2021年第8期67卷 95-104页

作者： Yuting Wu Chong Li xingchuan xia Hongyan Liang Qiqi Qi Yongchang Liu State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science&EngineeringTianjin UniversityTianjin300354China School of Material Science and Engineering Hebei University of TechnologyTianjin300130China

Recently,theγ’-strengthened superalloys are of great interests in high temperature applications due to their excellent high temperature strength which is derived from theγ’strengthening *** theseγ’-strengthened superalloys,the changes in morphology,size and distribution ofγ’precipitates due to coarsening during thermal exposure have a significant impact on the properties of *** article briefly summarizes the recent advances on the coarsening behavior of gamma prime precipitates in the recently-developedγ’-strengthened superalloys and its effects on the hot deformation behavior of superalloys,drawing specific examples on Allvac^(■)718 Plus TM and Ni3 Al-based intermetallic *** is found that the particle size plays an important role in morphological evolution ofγ’*** instance,the morphology ofγ’precipitates evolves from cuboidal to strip-like or other complex structures in Ni3 Al-based intermetallic alloys,while theγ’precipitates in Allvac^(■)718 Plus alloy always present nearspherical morphology due to the relatively small initial particle *** Lifshitz-Slyozof-Wagner(LSW)theory and its modifications,as well as Trans-Interface Diffusion Controlled(TIDC)theory have been applied to describing the coarsening kinetics ofγ’***,the hot deformation behavior ofγ’-strengthened superalloy is found to be greatly influenced by the coarsening ofγ’precipitates.

关键词： γ’-strengthened superalloy Microstructure Coarsening Hot deformation

Acoustic properties of closed-cell aluminum foams with different macrostructures

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Journal of Materials Science & Technology 2017年第11期33卷 1227-1234页

作者： xingchuan xia Zan Zhang Weimin Zhao Chong Li Jian Ding Chenxi Liu Yongchang Liu State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science & Engineering Tianjin University School of Materials Science & Engineering Hebei University of Technology

As structural materials, closed-cell aluminum foams possess obvious advantages in product dimension, strength and process economics compared with open cell aluminum foams. However, as a kind of structure-function integration materials, the application of closed-cell aluminum foams has been restricted greatly in acoustic fields due to the difficulty of sound wave penetration. It was reported that closed-cell foams with macrostructures have important effect on the propagation of sound waves. To date, the relationship between macrostructures and acoustic properties of commercially pure closedcell aluminum foams is ambiguous. In this work, different perforation and air gap types were designed for changing the macrostructures of the foam. Meanwhile, the effect of macrostructures on the sound absorption coefficient and sound reduction index were investigated. The results showed that the foams with half-hole exhibited excellent sound absorption and sound insulation behaviors in high frequency range（〉2500 Hz）. In addition, specimens with air gaps showed good sound absorption properties in low frequency compared with the foams without air gaps. Based on the experiment results, propagation structural models of sound waves in commercially pure closed-cell aluminum foams with different macrostructures were built and the influence of macrostructures on acoustic properties was discussed.

关键词： Closed-cell aluminum foam Sound absorption Sound insulation Macrostructure

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

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Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1709-1726页

作者： Xin He Jianbo Zhang Yuanyi Peng Jingan Li Jian Ding Chang Liu xingchuan xia Xueguang Chen Yongchang Liu School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China School of Material Science and Engineering Tianjin UniversityTianjin 300130China

In this work,water cooling,air cooling(AC)and furnace cooling(FC)were applied to investigate the effect of cooling rate on microstructure evolution of primaryγ′in a newly designed Ni3Al-based *** results showed that nucleation rate of primaryγ′increased with increasing cooling *** addition,higher cooling rate shortened growth period of primaryγ′,which made its morphology close to the initial precipitatedγ′.For AC and FC specimens,due to the lower cooling rate,primaryγ′possessed longer growth period and its morphology was mainly due to the evolution of lattice misfit betweenγand primaryγ′.Meanwhile,growth of primaryγ′depended on lattice misfit distribution between its corner and edge ***,primaryγ′morphologies of sphere,cube and concave cube with tip corners were illustrated by considering interaction between elemental diffusion and elastic strain energy.

关键词： Ni3Al-based alloy Primaryγ′ Cooling rate Nucleation rate Lattice misfit

Hot Deformation Behavior of ATI 718Plus Alloy with Different Microstructures

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Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1383-1396页

作者： Chang Liu Jianbo Zhang Yikai Yang xingchuan xia Tian He Jian Ding Ying Tang Zan Zhang Xueguang Chen Yongchang Liu School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China College of Physics and Electronic Engineering Xingtai UniversityXingtai 054001China School of Science Hebei University of TechnologyTianjin 300130.China School of Material Science and Engineering Tianjin UniversityTianjin 300130China

In this work, the eff ect of microstructure on hot deformation behavior of ATI 718Plus(hereinafter refers to 718Plus) alloy was studied by isothermal compression test. The results showed that when the strain rate was 0.01–0.1s^(-1) with deformation temperature of 980 and 1030℃, hot deformation behavior was mainly aff ected by dislocation density. Dislocation density of the air-cooling alloy was larger than that of the furnace-cooling alloy, which makes its critical strain smaller and peak stress higher than that of the furnace-cooling alloy. When the strain rate was 1 s^(-1), hot deformation behavior of the alloy was mainly aff ected by twins and γ ′ phase, and high-density deformation twins in air-cooling alloys resulted in higher critical strain. γ ′ phase exists in furnace-cooling alloy, which makes its peak stress higher than that of air-cooling alloy. 718Plus alloy is sensitive to cooling rate;dislocation and γ ′ phase have obvious eff ects on its hot deformation behavior.

关键词： 718Plus alloy Hot deformation Peak stress Dynamic recrystallization Critical strain

Modification Mechanism and Uniaxial Fatigue Performances of A356.2 Alloy Treated by Al-Sr-La Composite Refinement-Modification Agent

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 901-914页

作者： Liang Chang Qingfeng Zhao xingchuan xia Yuming Ding Binxu Guo Jian Ding Ying Tang Zan Zhang Chong Li xiaomian Sun Junjie Guo Kaihong Song Yongchang Liu School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China College of Physics and Electronic Engineering Xingtai UniversityXingtai 054001China School of Material Science and Engineering Tianjin UniversityTianjin 300130China CITIC Dicastal Co.Ltd. Qin Huangdao 066011China Qinhuangdao WKW Automotive Parts Co. Ltd.Qin Huangdao 066011China

Modification mechanism and uniaxial fatigue properties of A356.2 alloy treated by Al-6Sr-7La and traditional Al-5Ti-1B/Al-10Sr(hereinafter refers to traditional treated alloy) were investigated by constant stress amplitude method. Microstructure, dislocation and Si twinning of the alloys were studied by thermal analysis, scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results showed that Al-6Sr-7La possesses better refining and modification effect than Al-5Ti-1B/Al-10Sr. Meanwhile, fatigue properties of the alloy treated by Al-6Sr-7La are higher than traditional treated alloy, and this is mainly owing to that Al-6Sr-7La treated alloy has more twins in eutectic Si and lower twin spacing. In addition, higher density of nanophases formed on twin faces and La-rich clusters appear at multiple twin intersections. Stacking faults and entrapped nanophases appeared on growing Si twin faces. Impurity induced twinning(IIT) mechanism and twin plane re-entrant edge(TPRE) mechanism are valid for eutectic Si which are important for mechanical optimization of A356.2 alloy.

关键词： A356.2 alloy Al-6Sr-7La Fatigue property Eutectic Si Twins

高Fe、Cr含量多相Ni3Al基高温合金组织与性能研究进展

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金属学报 2020年第1期56卷 21-35页

作者：吴静刘永长李冲伍宇婷夏兴川李会军天津大学材料科学与工程学院水利安全与仿真国家重点实验室

Ni3Al基高温合金因其较高的承温能力、优异的高温抗氧化/耐蚀性、较低的密度及生产成本,拥有广阔的应用前景而受到了大量的关注。Ni3Al基高温合金进一步的推广应用迫切需要在确保可焊性的同时提高其热强性,在此背景下,本文首先简要阐述... 详细信息

Ni3Al基高温合金因其较高的承温能力、优异的高温抗氧化/耐蚀性、较低的密度及生产成本,拥有广阔的应用前景而受到了大量的关注。Ni3Al基高温合金进一步的推广应用迫切需要在确保可焊性的同时提高其热强性,在此背景下,本文首先简要阐述了在Ni3Al基高温合金的成分设计中,Fe、Cr组元的添加可有效改善Ni3Al基高温合金的相组成及焊接性能。针对可焊性优异的合金成分调整,进一步分析了一种高Fe、Cr元素添加Ni3Al基高温合金凝固过程的多相转变特征,对其在不同高温冷却、高温退火、长期时效工艺下的多相组织(γ’+γ两相、枝晶间β相、γ’包覆层等)演变规律进行了总结,并探讨了复杂组织变量(初生γ’相尺寸、β相形态、β内相演化、γ’包覆层宽化)对其蠕变行为的影响。最后,总结了多相Ni3Al基高温合金连接工艺的最新研究进展,并对多相Ni3Al基高温合金的进一步发展进行了展望。

关键词：高温合金 Ni3Al基成分设计热处理组织演变蠕变行为

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多孔镁合金的研究现状

特种铸造及有色合金 2015年第6期35卷 580-585页

作者：张赞陈晓伟夏兴川陈旭赵维民廖波河北工业大学材料科学与工程学院

简要介绍了多孔镁合金的特点及应用前景,同时重点介绍了多孔镁合金在国内外的研究现状,并指出了其在发展过程中存在的问题和未来的发展方向。

关键词：多孔镁合金研究现状问题及展望

纯铝基闭孔泡沫再生铝回收率和力学性能的研究

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热加工工艺 2016年第20期45卷 75-78页

作者：冯俊龙王晶夏兴川张赞赵维民河北工业大学材料科学与工程学院天津300130

利用氟盐作为覆盖剂,研究了氟盐的添加量对泡沫纯铝的回收率和泡沫再生铝力学性能的影响。结果表明:随覆盖剂含量的增加,闭孔泡沫纯铝的回收率呈先上升后下降的趋势,而泡沫再生铝的力学性能变化不大;与纯铝相比,泡沫再生铝的抗拉强度提... 详细信息

利用氟盐作为覆盖剂,研究了氟盐的添加量对泡沫纯铝的回收率和泡沫再生铝力学性能的影响。结果表明:随覆盖剂含量的增加,闭孔泡沫纯铝的回收率呈先上升后下降的趋势,而泡沫再生铝的力学性能变化不大;与纯铝相比,泡沫再生铝的抗拉强度提高了100%,抗弯强度提高了100%以上,布氏硬度提高了50%以上。通过形貌观察和XRD分析,发现再生铝晶粒得到明显的细化,并形成了Al-Ti新相,这些现象对再生铝的力学性能起到细晶强化和第二相强化作用。

关键词：氟盐泡沫再生铝回收率强度硬度细晶强化

ATI 718Plus高温合金微观组织与性能研究进展

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材料导报 2022年第4期36卷 149-156页

作者：仉建波李京桉彭远祎夏兴川刘畅丁俭陈学广刘永长河北工业大学材料科学与工程学院天津300130 天津大学材料科学与工程学院天津300072

ATI 718Plus(以下简称718Plus)是一种基于IN718高温合金改进的时效强化型镍基变形高温合金,已广泛应用于航空发动机的热端零部件。合金最初以锻造态引入,随着航空航天领域对大型复杂零部件需求的提高,锻造态合金已不能满足实际要求,因... 详细信息

ATI 718Plus(以下简称718Plus)是一种基于IN718高温合金改进的时效强化型镍基变形高温合金,已广泛应用于航空发动机的热端零部件。合金最初以锻造态引入,随着航空航天领域对大型复杂零部件需求的提高,锻造态合金已不能满足实际要求,因此在锻造态合金的基础上通过提高Nb含量开发出了铸造718Plus合金,并对其微观组织、焊接性能和拉伸性能开展了研究。锻造态和铸造态合金的化学成分与成型工艺的差异导致其微观组织及性能不同,因此阐明两种合金微观组织与使役性能之间的内在联系具有重要意义。本文综述了近年来锻造态和铸造态718Plus合金的微观组织调控及性能研究进展,包括:元素含量与分布状态对合金微观组织的影响,热处理制度对γ′相及η相分布状态的影响,热变形工艺与合金微观组织的关系,并得到最优热加工参数,总结了服役环境对合金蠕变、疲劳、焊接及抗氧化性能的作用机制,最后分析了合金研究过程中存在的问题及发展趋势。

关键词： 718Plus合金化学成分热变形热处理制度加工性能

添加Al-5Ti-B和Al-2Zr-Er对铸态铝锌镁合金力学性能的影响

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材料科学与工艺 2017年第2期25卷 39-44页

作者：丁俭靳子惠杜喜望赵乃勤赵维民夏兴川刘利华河北工业大学材料科学与工程学院天津300130 天津大学材料科学与工程学院天津300072 中信戴卡股份有限公司河北秦皇岛066003

铝锌镁合金以其优异的力学性能广泛应用于航空、航天、交通运输等工业领域,而铝合金的细化一直是铝加工行业的研究重点.为细化晶粒并提高其力学性能,本文将传统细化剂Al-Ti-B与RE复合添加到铝锌镁合金中,借助于XRD、光学显微镜、扫描电... 详细信息

铝锌镁合金以其优异的力学性能广泛应用于航空、航天、交通运输等工业领域,而铝合金的细化一直是铝加工行业的研究重点.为细化晶粒并提高其力学性能,本文将传统细化剂Al-Ti-B与RE复合添加到铝锌镁合金中,借助于XRD、光学显微镜、扫描电镜、拉伸实验等测试方法研究了不同细化剂对Al7Zn2.4Mg合金组织及其力学性能的影响.试验结果表明,合金中加入Al-5Ti-B和Al-Zr-Er后细化效果明显,单独添加Al-Ti-B的细化效果最好,但仍有少部分的晶粒保留的树枝晶形态.随着Al-Ti-B和Al-Zr-Er添加量的增多,合金的晶粒发生明显变化,塑性也随之增加,其中,添加0.4wt.%Al-5Ti-B细化剂对合金的塑性影响最大,而抗拉强度呈先增大后减小的趋势,复合添加0.2wt.%Al-2Zr-Er和0.2wt.%Al-5Ti-B细化剂的合金晶粒圆整且未出现树枝晶,晶界析出物最少平均抗拉强度最高.Al-Ti-B和Al-Zr-Er均可细化铸态铝锌镁合金的晶粒,同时添加两种细化剂更有利于提高合金的综合力学性能.

关键词：铝锌镁合金晶粒细化力学性能铸态组织 Al-Ti-B Al-Zr-Er