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Refined microstructure and enhanced mechanical properties of AlCrFe_(2)Ni_(2) medium entropy alloy produced via laser remelting

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Journal of Materials Science & Technology 2022年第4期99卷 18-27页

作者： Tianyi Han Yong Liu Mingqing Liao Danni Yang Nan Qu zhonghong lai Jingchuan Zhu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Center of Analysis and Measurement and Computing Harbin Institute of TechnologyHarbin 150001China

A Co-free as-cast AlCrAlCrFe_(2)Ni_(2)medium entropy alloy(MEA)with multi-phases was remelted by fiber laser in this *** effect of laser remelting on the microstructure,phase distribution and mechanical properties was investigated by characterizing the as-cast and the remelted AlCrAlCrFe_(2)Ni_(2)*** laser remelting process resulted in a significant decrease of grain size from about 780μm to 58.89μm(longitudinal section)and 15.87μm(transverse section)and an increase of hardness from 4.72±0.293 GPa to 6.40±0.147 GPa(longitudinal section)and 7.55±0.360 GPa(transverse section).It was also found that the long side plate-like microstructure composed of FCC phase,ordered B2 phase and disordered BCC phase in the as-cast alloy was transformed into nano-size weave-like microstructure consisting of alternating ordered B2 and disordered BCC *** mechanical properties were evaluated by the derived stressstrain relationship obtained from nano-indentation tests *** results showed that the yield stress increased from 661.9 MPa to 1347.6 MPa(longitudinal section)and 1647.2 MPa(transverse section)after *** individual contribution of four potential strengthening mechanisms to the yield strength of the remelted alloy was quantitatively evaluated,including grain boundary strengthening,dislocation strengthening,solid solution strengthening and precipitation *** calculation results indicated that dislocation and precipitation are dominant strengthening mechanisms in the laser remelted MEA.

关键词： Medium entropy alloy Laser remelting Microstructure Nano-indentation Strengthening mechanism

石墨烯/钛界面合金元素偏聚与界面反应抑制机理

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中国材料进展 2024年第3期43卷 222-229页

作者：陈佳莹熊小倩黄敬涛曲囡李明伟程源来忠红刘勇朱景川哈尔滨工业大学材料科学与工程学院黑龙江哈尔滨150001 哈尔滨工业大学特种环境复合材料技术国家级重点实验室黑龙江哈尔滨150001 哈尔滨工业大学分析测试与计算中心黑龙江哈尔滨150001

石墨烯/Ti基复合材料因具有轻质、高比强度和优异的耐腐蚀性特性而成为极具竞争力的金属基复合材料。然而,石墨烯作为一种优秀的增强体,由于可与Ti发生剧烈的界面反应,严重阻碍了石墨烯/Ti基复合材料的发展与应用。使用第一性原理计算... 详细信息

石墨烯/Ti基复合材料因具有轻质、高比强度和优异的耐腐蚀性特性而成为极具竞争力的金属基复合材料。然而,石墨烯作为一种优秀的增强体,由于可与Ti发生剧烈的界面反应,严重阻碍了石墨烯/Ti基复合材料的发展与应用。使用第一性原理计算研究合金元素对石墨烯/Ti复合材料界面行为以及电子结构的影响。选取9种合金元素(Ta,Mo,Sn,Pd,Si,Ni,Co,Mn和N)构建Ti/石墨烯/Ti界面掺杂模型,计算界面偏聚能、电子态密度、布局分析以及差分电荷密度。研究发现,当掺杂的合金元素为Ta,Mo和Sn时,界面偏聚能力较弱。同时,分析电子性质可以发现这9种合金元素均削弱了Ti原子与C原子之间的电荷转移。为新型基体钛合金设计和高性能石墨烯增强钛基复合材料设计提供了新的途径,为高性能石墨烯/Ti基复合材料的新型基体钛合金设计提供了重要参考。

关键词：石墨烯/Ti基复合材料合金元素第一性原理界面结构电子性质

舍曲林片联合相对卧床式森田疗法在伴非自杀性自伤青少年抑郁症中的应用效果

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中国当代医药 2024年第3期31卷 83-87页

作者：赖允娟温世萍赖忠红蔡文婷林萍江西省赣州市第三人民医院精神科江西赣州341000

目的探讨舍曲林片联合相对卧床式森田疗法在伴非自杀性自伤(NSSI)青少年抑郁症中的应用效果。方法选取2021年1月至2022年12月赣州市第三人民医院精神科收治的60例伴NSSI的青少年抑郁症患者作为研究对象,按照随机数字表法将其分为对照组... 详细信息

目的探讨舍曲林片联合相对卧床式森田疗法在伴非自杀性自伤(NSSI)青少年抑郁症中的应用效果。方法选取2021年1月至2022年12月赣州市第三人民医院精神科收治的60例伴NSSI的青少年抑郁症患者作为研究对象,按照随机数字表法将其分为对照组(30例)和研究组(30例)。对照组患者采用单一的舍曲林片治疗,研究组患者采用舍曲林片与相对卧床式森田疗法联合治疗。比较两组治疗前及治疗2、4、6周后的渥太华自伤量表(OSI)、汉密尔顿抑郁量表(HAMD)和生活质量简表(SF-36)评分。结果研究组治疗2、4、6周后的OSI评分均低于对照组,差异有统计学意义(P<0.05);研究组治疗2、4、6周后的HAMD评分均低于对照组,差异有统计学意义(P<0.05);研究组治疗6周后的SF-36评分高于对照组,差异有统计学意义(P<0.05)。结论伴NSSI青少年抑郁症患者采用舍曲林片与相对卧床式森田疗法联合治疗的效果较显著,不仅能有效减少其自伤行为的发生,还能减轻其抑郁症状,提高其生活质量,临床可进一步推广。

关键词：非自杀性自伤青少年抑郁症舍曲林片相对卧床式森田疗法

盐酸齐拉西酮联合丙戊酸钠对双相Ⅰ型障碍躁狂发作患者PANSS评分及微炎症指标的影响

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检验医学与临床 2024年第7期21卷 945-947,953页

作者：钟伦淳谢宇花赖忠红何海英江西省赣州市第三人民医院情感障碍科江西赣州341000 江西省赣州市第三人民医院心身医学科江西赣州341000

目的探讨双相Ⅰ型障碍(BP-Ⅰ)躁狂发作患者采用丙戊酸钠、盐酸齐拉西酮联合治疗的效果。方法按照随机数字表法将该院2022年1月至2023年1月收治的92例BP-Ⅰ躁狂发作患者分为对照组和观察组,各46例。对照组采用丙戊酸钠治疗,观察组在对照... 详细信息

目的探讨双相Ⅰ型障碍(BP-Ⅰ)躁狂发作患者采用丙戊酸钠、盐酸齐拉西酮联合治疗的效果。方法按照随机数字表法将该院2022年1月至2023年1月收治的92例BP-Ⅰ躁狂发作患者分为对照组和观察组,各46例。对照组采用丙戊酸钠治疗,观察组在对照组基础上加用盐酸齐拉西酮治疗,两组均治疗8周。比较两组倍克-拉范森躁狂量表(BRMS)评分、阳性与阴性症状量表(PANSS)评分、微炎症指标水平及不良反应发生情况。结果治疗后,两组PANSS评分及BRMS评分均降低(P0.05)。结论BP-Ⅰ躁狂发作患者采用丙戊酸钠、盐酸齐拉西酮联合治疗可减轻躁狂程度,改善精神症状,调节微炎症指标水平,且未增加不良反应,安全性好。

关键词：双相Ⅰ型障碍躁狂丙戊酸钠盐酸齐拉西酮炎症指标

认知行为疗法联合鲁拉西酮治疗精神分裂症的临床观察

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当代医学 2024年第12期30卷 122-125页

作者：赖忠红钟伦淳李红蔡文婷肖峰赣州市第三人民医院精神科江西赣州341000

目的探究认知行为疗法联合鲁拉西酮治疗精神分裂症的临床疗效。方法选取2021年9月至2022年12月赣州市第三人民医院收治的68例精神分裂症患者作为研究对象,随机分为实验组与对照组,每组34例。两组均接受常规化药物治疗,对照组给予鲁拉西... 详细信息

目的探究认知行为疗法联合鲁拉西酮治疗精神分裂症的临床疗效。方法选取2021年9月至2022年12月赣州市第三人民医院收治的68例精神分裂症患者作为研究对象,随机分为实验组与对照组,每组34例。两组均接受常规化药物治疗,对照组给予鲁拉西酮治疗,实验组给予认知行为疗法联合鲁拉西酮治疗。比较两组治疗2、6个月的总有效率,治疗前后神经心理状态评价量表(RBANS)量表评分及不良反应发生情况。结果实验组治疗2、6个月总有效率分别为79.41%、94.12%,均高于对照组的55.88%、73.53%,差异有统计学意义(P<0.05)。治疗2、6个月,两组即刻记忆、视觉空间、语言、注意力及延迟记忆评分均高于前一时间点,且实验组高于对照组,差异有统计学意义(P<0.05)。两组不良反应发生率比较差异无统计学意义。结论认知行为疗法联合鲁拉西酮治疗精神分裂症的效果显著,能缓解精神病理,改善认知功能,安全性高。

关键词：认知行为疗法鲁拉西酮精神分裂症阳性和阴性症状评定量表神经心理状态评价量表

Effects of Annealing on Microstructure, Mechanical and Electrical Properties of AlCrCuFeMnTi High Entropy Alloy

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1196-1200页

作者： NONG Zldsheng NONG Zldsheng ZHU Jingchuan YANG Xiawei YU Hailing lai zhonghong School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China

The multi-component A1CrCuFeMnTi high entropy alloy was prepared using a vacuum arc melting process. Serial annealing processes were subsequently performed at 590 ℃, 750 ℃, 955 ℃ and 1 100 ℃ respectively with a holding time of 4 h at each temperature. The effects of annealing on microstructure, mechanical and electrical properties of as-cast alloy were investigated by using differential thermal analysis （DTA）, X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The experimental results show that two C14 hexagonal structures remain unchanged after annealing the as-cast A1CrCuFeMnTi alloy specimens being heated to 1 100℃. Both annealed and as-cast microstructures show typical cast-dendrite morphology and similar elemental segregation. The hardness of alloys declines as the annealing temperature increases while the strength of as-cast alloy improves obviously by the annealing treatment. The electrical conductivities of annealed and as-cast alloys are influenced by the distribution of interdendrite re^ions which is rich in Cu element.

关键词： high entropy alloy annealing microstructure mechanical properties electrical conductivity

MICROSTRUCTURE　AND　THERMAL　STRESS　RELAXATION　OF　ZrO_2－Ni　FUNCTIONALLY　GRADED　MATERIAL

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中国有色金属学会会刊：英文版 1996年第4期6卷 94-99页

作者： Zhu Jingchuan Yin Zhongda lai zhonghong Li Jian(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001) School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

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ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＴＨＥＲＭＡＬＳＴＲＥＳＳＲＥＬＡＸＡＴＩＯＮＯＦＺｒＯ_２－ＮｉＦＵＮＣＴＩＯＮＡＬＬＹＧＲＡＤＥＤＭＡＴＥＲＩＡＬ￥ＺｈｕＪｉｎｇｃｈｕａｎ；ＹｉｎＺｈｏｎｇｄａ；ＬａｉＺｈｏｎｇｈｏｎｇ；ＬｉＪｉａｎ（Ｓｃｈｏ?..

关键词： functionally graded material zirconia nickel microstructure thermal stress relaxation

Microstructure and Mechanical Properties of ZrO_2-Ni Functionally Gradient Material

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Journal of Materials Science & Technology 1994年第3期10卷 188-192页

作者： Jingchuan ZHU Zhongda YIN and zhonghong lai(Dept. of Metals and Technology, Harbin Institute of Technology, Harbin, 150001. China) Harbin Inst of Technology Harbin China

The fabrication. microstructure and mechanical properties of ZrO2-Ni functionally gradient materials (FGM ) have been studied. FGM as well as non-FG M of ZrO2-Ni system was developed by powder metallurgical process. X-ray diffractometer (XRD ). electron probe microanalyzer (EPMA), scanning electron microscope (SEM ) and optical microscope were employed to investigate the crystalline phases. chemical composition and microstructure Experimental results demonstrate that the composition and microstructure of ZrO2-Ni FGM have the expected gradient distribution. There are no distinct interfaces in the FGM due to the gradient change of components. that is, the constituents are continuous in microstructure everywhere. Moreover, Vickers hardness and flexural strength were measured for the common composites as a function of composition. It is made clear that the mechanical properties of the FGM vary corresponding to the constitutional changes as well

关键词： FGM PSZ Microstructure and Mechanical Properties of ZrO2-Ni Functionally Gradient Material Ni

Study on Laser Welding of Al Composite

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Journal of Materials Science & Technology 2001年第1期17卷 173-174页

作者： Jitai NIU zhonghong lai MuZhen WANG Liming LIU and Lin WU National Key Laboratory of Advanced Welding Production Technology, Harbin institute of Technology, Harbin 150001, China Harbin Inst. of Technol. Harbin 150001 China

The effects of laser welding parameter on strength of welded joints were studied. The mechanism for loss of joint strength was analyzed. It was pointed out that an important factor affecting joint strength is the reaction between matrix and reinforced phase. On the basis of this, the concept of critical St activity a[si]min was proposed. Using appropriate welding parameters and Si activity, high quality laser welded joints in an aluminum matrix composite SiCw/6061Al can be Successfully obtained.

关键词： joint strength welded joints aluminum matrix composite welding parameters strength of