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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 807-813页

作者： Xiaoyuan Yuan Yuan Wu Xiongjun Liu Hui Wang suihe jiang Zhaoping Lü State Key Laboratory for Advanced Metals and Materials Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China

The coupling effects of the metastable austenitic phase and the amorphous matrix in a transformation-induced plasticity(TRIP)-reinforced bulk metallic glass(BMG)composite under compressive loading were investigated by employing the digital image correlation(DIC)*** evolution of local strain field in the crystalline phase and the amorphous matrix was directly monitored,and the contribution from the phase transformation of the metastable austenitic phase was *** shear strain was found to be effectively consumed by the displacive phase transformation of the metastable austenitic phase,which relaxed the local strain/stress concentration at the interface and thus greatly enhanced the plasticity of the TRIP-reinforced BMG *** current study sheds light on in-depth understanding of the underlying deformation mechanism and the interplay between the amorphous matrix and the metastable crystalline phase during deformation,which is helpful for design of advanced BMG composites with further improved properties.

关键词： bulk metallic glass composite transformation-induced plasticity digital image correlation local shear strain

Local chemical ordering and its impact on radiation damage behavior of multi-principal element alloys

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Journal of Materials Science & Technology 2023年第4期135卷 13-25页

作者： Leqing Liu Xiongjun Liu Qing Du Hui Wang Yuan Wu suihe jiang Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

Multi-principal element alloys(MPEAs)have attracted much attention as future nuclear materials due to their extraordinary radiation *** this work,we have elucidated the development of local chemical orderings(LCOs)and their influences on radiation damage behavior in the typical CrFeNi MPEA by hybrid-molecular dynamics and Monte Carlo *** was found that considerable LCOs consist-ing of the Cr-Cr and Ni-Fe short-range orders existed in the ordered configuration with optimized system *** modeling the accumulation cascades up to 1000 recoils,we revealed that the size of de-fect clusters and dislocation loops is smaller in the ordered configuration than those in the random one,although the former formed more Frenkel pairs(i.e.,self-interstitials and vacancies).In addition,the dis-tribution of dislocation loops is relatively more dispersed in the ordered configuration,and the stair-rod dislocations related to irradiation swelling are also smaller,implying that the existence of LCOs is con-ducive to enhancing radiation damage *** understand the underlying mechanism,the effects of LCOs on the formation and evolution of defects and radiation resistance were discussed from the aspects of atomic bonding,migration path,and energy of defect diffusion,which provides theoretical guidance for the design of MPEAs with enhanced radiation resistance.

关键词： Multi-principal element alloys Local chemical ordering Radiation damage Dislocation evolution Molecular dynamics simulation

Enhancing properties of high-entropy alloys via manipulation of local chemical ordering

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Journal of Materials Science & Technology 2024年第13期180卷 23-31页

作者： Yihan Wang Meiyuan Jiao Yuan Wu Xiongjun Liu Hui Wang suihe jiang Xiaobin Zhang Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

*** High entropy alloys(HEAs),arising from the incorporation of multiple principal elements[1,2],have garnered extensive atten-tion due to their great potential to be utilized under extreme con-ditions[3-5].

关键词： alloys entropy utilized

Bulk ultrafine grained microstructures with high thermal stability via intragranular precipitation of coherent particles

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Journal of Materials Science & Technology 2024年第14期181卷 220-230页

作者： Shenglong Liang Xiaochun Liu suihe jiang Huihui Zhu Wei Li Leqing Liu Xiongjun Liu Yuan Wu Xiaobin Zhang Hui Wang Zhaoping Lu Beijing Advanced Innovation Centre for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410000China Liaoning Academy of Materials Shenyang 110000China Inner Mongolia University of science and technology Instrumental Analysis CenterBaotou 014000China

Producing ultrafine-grained(UFG)microstructures with enhanced thermal stability is an important yet challenging route to further improve mechanical properties of structural ***,a high-performance bulk UFG copper that can stabilize even at temperatures up to 750℃(∼0.75 T m,T m is the melting point)was fabricated by manipulating its recrystallization behavior via low alloying of *** of 1 wt.%–1.5 wt.%of Co can trigger quick and copious intragranular clustering of Co atoms,which offers high Zener pinning pressure and pins the grain boundaries(GBs)of freshly recrystallized ul-trafine *** to the fact that the subsequent growth of the coherent Co-enriched nanoclusters was slow,sufficient particles adjacent to GBs remained to inhibit the migration of GBs,giving rise to the UFG microstructure with prominently high thermal *** work manifests that the strategy for pro-ducing UFGs with coherent precipitates can be applied in many alloy systems such as Fe-and Cu-based,which paves the pathway for designing advanced strain-hardenable UFGs with plain compositions.

关键词： Copper alloys Coherent precipitation Ultrafine-grained materials Recrystallization Microstructural stability

Effects of trace elements on mechanical properties of the TiZrHfNb high-entropy alloy

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Journal of Materials Science & Technology 2023年第21期152卷 135-147页

作者： Xiaoyuan Yuan Yuan Wu Meisa Zhou Xiongjun Liu Hui Wang suihe jiang Xiaobin Zhang Honghui Wu Xiaochun Liu Zipan Chen Xiangqi Xu Zhaoping Lu State Key Laboratory for Advanced Metals and Materials Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Institute of Metals Changsha University of Science&TechnologyChangsha 410004China School of Mechanical Engineering Tongling UniversityTongling 244000China

Refractory high-entropy alloys have great potential to be utilized as high-temperature materials,and the repeatability and reproducibility of their mechanical properties are critical for practical *** this work,nevertheless,we found that the mechanical properties of the TiZrHfNb HEA greatly varied with the content of impurities in the samples even using high-purity raw ***,the oxygen impurity is mainly responsible for the increment of the yield stress due to the strong interstitial hardening effect,whilst the ductility deterioration closely associates with the content of metalloid elements B,C,and *** analysis reveals that the metalloid elements not only tend to segregate at grain boundaries but also enhance the aggregation of Zr and *** co-segregation induced the formation of strong(Zr,Ti)-metalloid bonds,resulting in grain boundary embrittlement and brittle *** current work demonstrates that the impurity contents in refractory HEAs need to be strictly controlled during production in order to improve their stability of mechanical performance.

关键词： High-entropy alloy Impurities Grain boundary embrittlement Co-segregation effect

激光冲击下CoCrFeMnNi高熵合金微观塑性变形的分子动力学模拟

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力学学报 2021年第12期53卷 3331-3340页

作者：杜欣熊启林周留成阚前华蒋虽合张旭西南交通大学力学与工程学院成都610031 华中科技大学航空航天学院武汉430074 空军工程大学等离子体动力学重点实验室西安710038 北京科技大学新金属材料国家重点实验室北京100083

激光冲击强化技术可以有效地提高材料的疲劳寿命,被广泛应用于航空航天领域.CoCrFeMnNi高熵合金作为一种经典的高熵合金体系,研究其激光冲击强化后的微观组织变化以及冲击动态响应对该材料未来在航空航天领域中的应用具有重要意义.采用... 详细信息

激光冲击强化技术可以有效地提高材料的疲劳寿命,被广泛应用于航空航天领域.CoCrFeMnNi高熵合金作为一种经典的高熵合金体系,研究其激光冲击强化后的微观组织变化以及冲击动态响应对该材料未来在航空航天领域中的应用具有重要意义.采用分子动力学方法,对CoCrFeMnNi高熵合金进行了冲击模拟,发现冲击时弹、塑性双波分离现象以及微结构演化具有明显的取向相关性.沿[100]方向进行冲击时未出现双波分离结构,并且塑性变形过程中会产生中间相;而沿[110]与[111]方向冲击时产生了双波分离结构,并且受冲击区域存在大量的层错以及无序结构,高位错密度是产生无序结构的重要原因.双波分离现象与可开动滑移系个数有关,而沿不同取向冲击时的Hugoniot弹性极限和发生塑性变形的临界冲击速度与其可开动滑移系的Schmid因子大小有关.此外,冲击诱导了梯度位错结构的产生,位错密度沿冲击深度先增加后减小,在沿原子密排方向冲击时产生了更高的位错密度.冲击之后在模型两侧存在残余压应力,芯部为残余拉应力,残余应力的大小具有明显的取向相关性.最后,与具有相同尺寸及取向的纯Ni进行对比,发现CoCrFeMnNi高熵合金在冲击过程中由于晶格畸变效应产生了较纯Ni更多的无序结构.

关键词：激光冲击高熵合金弹塑性双波分离取向相关性残余应力位错密度分子动力学

Fe-Ni-Al超高强度双相钢的复合析出行为和强化机制

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钢铁研究学报 2023年第7期35卷 873-880页

作者：肖月华彭博范爱琴蒋虽合王先珍文山学院冶金与材料学院云南文山663099 北京科技大学新金属材料国家重点实验室北京100083 钢铁研究总院有限公司科技信息与战略研究所北京100081 北京科技大学新材料技术研究院北京100083

协同利用残余奥氏体、高密度共格NiAl和半共格(Mo, Cr)_(2)C析出相,设计了Fe-Ni-Al-Cr-Mo-Mn-C新型无Co超高强度双相钢,屈服强度和抗拉强度分别达到1 730和2 105 MPa,断后伸长率为12.1%,其中均匀伸长率达到7.3%,明显优于传统马氏体时效... 详细信息

协同利用残余奥氏体、高密度共格NiAl和半共格(Mo, Cr)_(2)C析出相,设计了Fe-Ni-Al-Cr-Mo-Mn-C新型无Co超高强度双相钢,屈服强度和抗拉强度分别达到1 730和2 105 MPa,断后伸长率为12.1%,其中均匀伸长率达到7.3%,明显优于传统马氏体时效钢。通过透射电镜和电子背散射衍射等表征技术发现,钢中含有体积分数近12%的残余奥氏体,主要以1~2μm的颗粒形态分布于原奥氏体晶界和板条界等位置,这种非连续的奥氏体颗粒在不明显降低材料强度的同时极大提升了应变硬化和均匀伸长率。而马氏体基体中在无Co条件下通过两相协同作用避免了生成脆性渗碳体,并形成了等效半径均为1.5 nm左右的超高密度的共格NiAl和半共格M_(2)C析出相,显著提升了材料强塑性。结果表明,通过协同调控软硬相分布和协同析出行为可开发新型低成本无Co高性能超高强度钢。

关键词：超高强度钢协同析出加工硬化均匀伸长率强塑性

Al和Cr协同作用提高核用高强钢耐水蒸气氧化性能

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金属学报 2024年第3期60卷 357-366页

作者：彭祥阳张乐李聪聪侯硕刘迪周建明路广遥蒋虽合中广核研究院有限公司设备研究所深圳518000 北京科技大学新金属材料国家重点实验室北京100083

前期研发的Fe-Ni-Al基超高强度马氏体时效钢表现出了良好的力学和抗辐照性能,然而典型Cr_(2)O_(3)氧化保护膜的耐热钢在轻水反应堆高温高压含水蒸气的服役环境中极易失效,亟待研发兼具抗高温水蒸气氧化、优异力学和抗辐照性能的先进材... 详细信息

前期研发的Fe-Ni-Al基超高强度马氏体时效钢表现出了良好的力学和抗辐照性能,然而典型Cr_(2)O_(3)氧化保护膜的耐热钢在轻水反应堆高温高压含水蒸气的服役环境中极易失效,亟待研发兼具抗高温水蒸气氧化、优异力学和抗辐照性能的先进材料。本工作在前期研发的Fe-Ni-Al系超高强度马氏体时效钢基础上添加不同含量的Cr元素,在保持新型马氏体钢优异力学性能的同时,对其在干燥空气和含水蒸气环境中的氧化性能进行研究。采用非自耗真空电弧炉制备合金铸锭,并对时效处理后的高强钢进行600℃干燥空气和潮湿空气2种环境中的抗氧化性能测试,对氧化后样品的表面和截面形貌进行微观组织表征。结果表明,添加9%Cr后的Fe-13Ni-2.3Al高强钢在600℃空气+10%水蒸气的气氛中氧化100 h的平均单位面积增重仅为0.1 mg/cm^(2),是添加5%Cr的Fe-13Ni-2.3Al高强钢和Fe-18Ni-3Al马氏体时效钢的1/50。对氧化后高强钢微观组织表征分析表明,在Al和Cr元素协同作用下,Fe-13Ni-9Cr-2.3Al高强钢在600℃空气+10%水蒸气条件下表面自发形成了富Fe、Cr、Al的复合氧化膜,提高了抗高温水蒸气氧化性能,其中Cr通过第三组元效应降低氧化物膜-基体界面氧分压,从而促进在高温水蒸气条件下在基体表面形成致密连续的富Al氧化膜。

关键词：超高强度钢水蒸气氧化氧化膜第三组元效应协同效应

新型含铝奥氏体不锈钢在含硫化氢环境中的腐蚀行为

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钢铁研究学报 2023年第6期35卷 720-729页

作者：肖月华李聪聪王先珍蒋虽合王辉文山学院冶金与材料学院云南文山663099 北京科技大学新金属材料国家重点实验室北京100083 北京科技大学新材料技术研究院北京100083

奥氏体不锈钢由于具有优异的抗氯化物点蚀和应力腐蚀性能,成为油气田环境中最常用的结构材料之一。然而,关于奥氏体不锈钢在Cl--H_(2)S共同存在的腐蚀环境下的腐蚀行为的相关研究还不充分,特别是有关Al、Mo等合金化元素对钝化保护膜的... 详细信息

奥氏体不锈钢由于具有优异的抗氯化物点蚀和应力腐蚀性能,成为油气田环境中最常用的结构材料之一。然而,关于奥氏体不锈钢在Cl--H_(2)S共同存在的腐蚀环境下的腐蚀行为的相关研究还不充分,特别是有关Al、Mo等合金化元素对钝化保护膜的形成行为及耐蚀性能的影响规律尚不清楚。因此,结合奥氏体不锈钢在复杂油气田环境下的应用前景,研究选用创新设计的新型含铝奥氏体不锈钢,通过电化学方法对其在Cl--H_(2)S耦合环境条件下的的耐腐蚀性能展开全面评估,采用XPS、SEM、TEM等显微分析手段观察其腐蚀行为,揭示其耐腐蚀机制和耦合腐蚀介质作用规律。结果表明,新型含铝奥氏体不锈钢尽管在复杂腐蚀条件下未能形成富Al的钝化保护膜层,但由于适量Mo的加入,明显提高了抗点蚀性能,因此具有良好的耐H_(2)S腐蚀性能。

关键词：新型含铝奥氏体不锈钢硫化氢电化学腐蚀点蚀钝化膜

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纳米晶合金热稳定性的熵调控设计

金属学报 2021年第4期57卷 403-412页

作者：王一涵原园喻嘉彬吴宏辉吴渊蒋虽合刘雄军王辉吕昭平北京科技大学新金属材料国家重点实验室北京100083

具有纳米尺度晶粒的纳米晶合金由于具有高强度和高硬度而成为材料领域的关注热点,然而,由于晶界占比高,纳米晶合金的热稳定性差,严重制约了在高温甚至室温下的应用。近年来,纳米晶高熵合金由于显著的高熵效应而展现出特殊性能,这一效应... 详细信息

具有纳米尺度晶粒的纳米晶合金由于具有高强度和高硬度而成为材料领域的关注热点,然而,由于晶界占比高,纳米晶合金的热稳定性差,严重制约了在高温甚至室温下的应用。近年来,纳米晶高熵合金由于显著的高熵效应而展现出特殊性能,这一效应同时能在一定程度上缓解纳米晶在较高温度下的低热稳定性问题。本文通过对纳米晶合金常用的热稳定策略和相关研究进展的分析与归纳,探讨从熵调控的角度利用多组元的高熵效应设计的具有高热稳定性的纳米晶高熵合金的稳定机理和力学性能。已有研究结果表明,纳米晶高熵合金有望拓宽纳米晶合金的领域,同时可为突破纳米晶合金低热稳定性瓶颈提供新的思路。

关键词：高熵合金纳米晶合金热稳定性高熵效应