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| 1 | Influence of Temperature on Stacking Fault Energy and Creep Mechanism of a Single Crystal Nickel-based Superalloy显示文摘The influence of temperatures on the stacking fault energies and deformation mechanism of a Recontaining single crystal nickel-based superalloy during creep at elevated temperatures was investigated by means of calculating the stacking fault energy of alloy, measuring creep properties and performing contrast analysis of dislocation configuration. The results show that the alloy at 760 °C possesses lower stacking fault energy, and the stacking fault of alloy increases with increasing temperature. The deformation mechanism of alloy during creep at 760 °C is γ′ phase sheared by <110> super-dislocations, which may be decomposed to form the configuration of Shockley partials plus super-lattice intrinsic stacking fault, while the deformation mechanism of alloy during creep at 1070 °C is the screw or edge superdislocations shearing into the rafted γ′ phase. But during creep at 760 and 980 °C, some superdislocations shearing into γ′ phase may cross-slip from the {111} to {100} planes to form the K–W locks with non-plane core structure, which may restrain the dislocations slipping to enhance the creep resistance of alloy at high temperature. The interaction between the Re and other elements may decrease the diffusion rate of atoms to improve the microstructure stability, which is thought to be the main reason why the K–W locks are to be kept in the Re-containing superalloy during creep at 980 °C. | Sugui Tian Xinjie Zhu Jing Wu Huichen Yu Delong Shu Benjiang Qian | 2016 | Journal of Materials Science & Technology2016，32，8： | 7 |
| 2 | Out of phase thermal mechanical fatigue investigation of a directionally solidified superalloy DZ125显示文摘Out of phase(OP) thermal mechanical fatigue(TMF) behavior of a directionally solidified(DS) superalloy DZ125 was experimentally and numerically studied. Two different temperature conditions, which are 500–1000 °C and 400–900 °C, were considered in the present research.Stress and strain responses as well as fatigue life results were presented and discussed. Scanning electron microscope(SEM) and metallographic analysis were used to study the damage mechanism. An oxidation assisted crack initiation and propagation phenomenon were found to explain the shorted life under TMF cycles. In order to characterize the stress and strain deformations under TMF loadings, a modified Chaboche's constitutive model was applied. Additionally, the TMF life of the material was modeled and predicted by Neu–Sehitoglu damage law with high accuracy. | Hu Xiaoan Yang Xiaoguang Shi Duoqi Yu Huichen | 2016 | Chinese Journal of Aeronautics2016，29，1： | 3 |
| 3 | LCF behavior and life prediction method of a single crystal nickel-based superalloy at high temperature显示文摘低周期疲劳测试在单个水晶上被进行基于镍的 superalloy, DD6,与不同结晶的取向(即,[001 ] ,[011 ] ,并且[111 ]) 并且紧张居住类型(即,张力,压缩,并且平衡类型) 在某个高温度。给材料 anisotropy 和平均数应力,两个取向因素和压力范围被介绍给铁匠,沃森,并且更最高(SWT ) 强调模型预言疲劳生活。试验性的结果显示 DD6 的疲劳性质取决于结晶的取向和装载类型。疲劳生活张力,压缩,并且因为,平衡紧张居住测试比没有紧张居住的连续骑车测试的那些缺少重要爬效果。建议修改 SWT 压力方法的预言的结果与试验性的数据同意很好。 | Zhihua ZHANG Huichen YU Chengli DONG | 2015 | Frontiers of Mechanical Engineering2015，10，4： | 2 |
| 4 | Determination of mixed-mode interfacial fracture toughness for thermal barrier coatings显示文摘In this work,a test method was developed to determine the interfacial fracture toughness of the air plasma sprayed (APS) thermal barrier coatings (TBCs) over a wide range of mode mixities.For this mixed-mode test method,the analytical expressions for the energy release rate and stress intensity factors were derived based on the energy theory and the concept of 'equivalence'.The fidelity of these expressions was affirmed by selected finite element analysis.The experimental results showed that the critical energy release rate increased with the increase of the positive mode mixity,which was mainly due to the increase in contact/friction effect and plastic work dissipation with increasing shear mode loading.Furthermore,an elliptical interfacial failure criterion in terms of the stress intensity factors was proposed.The agreement between the experimental results in the literature and those in our work indicated that our test method and the corresponding analytical solutions can well determine the interfacial fracture toughness of the TBCs over a wide range of mode mixities. | DENG HongXia SHI HuiJi YU HuiChen ZHONG Bin | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，4： | 2 |
| 5 | Ex perimental investigation on microcrack initiation process in nickel based superalloy DAGH4169 显示文摘 | HUANG Xinyue YU Huichen XU Manqiong | 2012 | International Journal of Fatigue2012，42，： | 1 |
| 6 | Low cycle fatigue be- havior and life evaluation of a P/M nickel base superalloy under different dwell eonditions显示文摘 | Yu Huichen Li Ying Huang Xinyue | 2010 | Procedia Engineering2010，2，1： | 1 |
| 7 | Experimental investigation on microcrack initiation process in nickel-based superalloy DAGH4169显示文摘 | Huang Xinyue Yu Huichen Xu Manqiong | 2012 | International Journal of Fatigue2012，42，： | 1 |
| 8 | Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy显示文摘The creep behavior of the DZ125 superalloy at high temperatures has been investigated based on the creep properties measurement and microstructure observations. The experimental results show that, after full heat treatment, the fine and coarser cuboidal γ0precipitates distributed in the dendrite arm and inter-dendrite regions, respectively, the boundaries with various configurations located in the inter-dendrite regions. In the primary creep stage, the cuboidal γ0phase in the alloy transformed into the rafted structure along the direction vertical to the stress axis.The dislocations slipping and climbing over the rafted γ0phase are attributed the deformation mechanism of the alloy during steady-state creep.The(1/2)?1 1 0? dislocations slipping in the γ matrix and ?1 1 0? super-dislocations shearing into the γ0phase are the deformation mechanisms of the alloy in the latter stage of creep. And then the alternate slipping of dislocations results in the initiation and propagation of the micro-cracks along the boundaries until the occurrence of the creep fracture. Since the grain boundaries with various angles relative to the stress axis distribute in the different regions, the initiation and propagation of micro-cracks along the boundaries display the various features.& 2014 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved. | Haofang Sun Sugui Tian Ning Tian Huichen Yu Xianlin Meng | 2014 | Progress in Natural Science:Materials International2014，24，3： | 1 |
| 9 | Creep behavior and effect factors of a TiAl-Nb alloy at high temperatu显示文摘The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was investigated.The results showed that the microstructure of forged alloy mainly consisted ofγ/α2 lamellar colonies and fine equiaxed recrystallizedγ/α2 grains.During the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed grains.Compared with the forged alloy the creep life of the solution treated alloy at 800℃/220 MPa increased from 116 h to 339 h.The better creep resistance may be attributed to the transform of fine equiaxedγ/α2 grain to the lamellar colonies with serrated grain boundaries due to the solution treatment.The deformation mechanism of the solution treated alloy during creep is considered to be dislocation slipping within the lamellarγ/α2 phases,and the dislocation movement may be hindered by theγ/α2 interface and the formation of dislocation tangles.The interaction of the dislocations with the tangles may increase the resistance of the dislocation motion and hence improve the creep resistance of the alloy.It was found that during the creep of the forged alloys the cracks mainly initiated at the equiaxed grain,and in the solution treated alloy the cracks initiated at the grain boundaries.As creep continued the cracks propagated and connected to each other,leading to the damage and rupture of the forged and solution treated alloys. | Shunke Zhang Sugui Tian Gengyu Li Ning Tian Fangwei Jin Huichen Yu Xiaoxia Lv Guangyan Wang Deyuan Li | 2021 | Progress in Natural Science:Materials International2021，31，3： | 0 |
| 10 | Deformation and damage behaviors of as-cast TiAl-Nb alloy during creep显示文摘By means of creep properties measurement and microstructure observation,the deformation and damage behavior of an as-cast TiAl-Nb alloy during creep at temperature near 750°C were investigated.The results showed that the microstructure of the alloy consisted of lamellarγ/α_2 phase,and the boundaries consisted ofγphase located in between lamellarγ/α_2 phases with different orientations.In the latter stage of creep,the dislocation networks appeared in the interfaces of lamellarγ/α_2 phases due to the coarsening of them,which made the coherent interface transforming into the semi-coherent one for reducing its adhesive strength.The deformation mechanism of the alloy during creep was twinning and dislocations slipping within lamellarγ/α_2 phases.In the later period of creep,significant amount of dislocations plied up in the interfaces of lamellarγ/α_2 phases,which may cause the stress concentration to promote the initiation and propagation of the cracks along the lamellarγ/α_2interfaces perpendicular to the stress axis.Wherein,some cracks on the various cross-sections were connected by tearing edge along the direction of maximum shear stress,up to the creep fracture,which is considered to be the damage and fracture mechanism of alloy during creep at 750°C. | Shunke Zhang Sugui Tian Xiaoxia Lv Huichen Yu Ning Tian Zehui Jiao Guoqi Zhao Deyuan Li | 2018 | Progress in Natural Science:Materials International2018，28，5： | 0 |
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