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| 1 | Optimizing mechanical property and cytocompatibility of the biodegradable Mg-Zn-Y-Nd alloy by hot extrusion and heat treatment显示文摘The Mg-Zn-Y-Nd alloy is a new type of degradable material for biomedical application. In the present study, Mg-6Zn-1.2Y-0.8Nd alloy was fabricated, and then extrusion and heat treatment were conducted to optimize its mechanical properties and cytocompatibility. The microstructure observation, mechanical property, degradation behavior and cytocompatibility tests were conducted on the Mg-Zn-Y-Nd alloy with three different states: as-cast(alloy C), as-extruded(alloy E) and extruded + heat treated(alloy EH).The results show that alloy C consists of coarse grains and continuous secondary phases. The extrusion process has caused incomplete recrystallization, and results in a mixed grain structure of elongated grains and small equiaxed grains(alloy E). The heat treatment process has promoted the recrystallization and homogenized the grain structure(alloy EH). Both the strength and ductility of the alloy has been improved by extrusion, but the following heat treatment has decreased the strength and increased the ductility.The degradation behavior of the alloy C and E alloys does not show much difference, but improves slightly in alloy EH, because the heat treatment has homogenized the microstructure and released the residual stress in the alloy. The directly and indirectly cell viability tests indicate that alloy EH exhibits the best cytocompatibility, which should be ascribed to its relative uniform degradation and low ion releasing rate. In summary, the combination of hot extrusion and heat treatment could optimize the mechanical property and cytocompatibility of the Mg-Zn-Y-Nd alloy together, which is beneficial for the future application of the alloy. | Yiyuan Kang Beining Du Yueming Li Baojie Wang Liyuan Sheng Longquan Shao Yufeng Zheng Tingfei Xi | 2019 | Journal of Materials Science & Technology2019，35，1： | 8 |
| 2 | Tensile, creep behavior and microstructure evolution of an as-cast Ni-based K417G polycrystalline superalloy显示文摘The Ni-based K417 G superalloy is extensively applied as aeroengine components for its low cost and good mid-temperature(600–900?C) properties. Since used in as-cast state, the comprehensive understanding on its mechanical properties and microstructure evolution is necessary. In the present research,the tensile, creep behavior and microstructure evolution of the as-cast K417 G superalloy under different conditions were investigated. The results exhibit that tensile cracks tend to initiate at MC carbide and γ/γ' eutectic structure and then propagate along grain boundary. As the temperature for tensile tests increases from 21?C to 700?C, the yield strength and ultimate tensile strength of K417 G superalloy decreases slightly, while the elongation to failure decreases greatly because of the intermediate temperature embrittlement. When the temperature rises to 900?C, the yield strength and ultimate tensile strength would decrease significantly. The creep deformation mechanism varies under different testing conditions. At 760?C/645 MPa, the creep cracks initiate at MC carbides and γ/γ' eutectic structures,and propagate transgranularly. While at 900?C/315 MPa and 950?C/235 MPa, the creep cracks initiate at grain boundary and propagate intergranularly. As the creep condition changes from 760?C/645 MPa to 900?C/315 MPa and 950?C/235 MPa, the ? phase starts to raft, which reduces the creep deformation resistance and increases the steady-state deformation rate. | Beining Du Ziyang Hu Liyuan Sheng Chuanyong Cui Jinxia Yang Yufeng Zheng Xiaofeng Sun | 2018 | Journal of Materials Science & Technology2018，34，10： | 4 |
| 3 | Effect of extrusion process on the mechanical and in vitro degradation performance of a biomedical Mg-Zn-Y-Nd alloy显示文摘A new type of biomedical Mg-Zn-Y-Nd alloy was developed and thermal extruded by different processes to investigate the effect of extrusion ratio and extrusion pass on its microstructure,mechanical property and degradation performance.The results show that the increase of extrusion ratio could promote the dynamic recrystallization(DRX)process and led to the coarsening of DRXed grains.While the increase of extrusion pass also contributes to the DRX process but refines the DRXed grains.The simultaneous increasing of extrusion ratio and extrusion pass refines the secondary phases obviously.The increase of extrusion ratio has reduced the tensile strength but improved the elongation of the alloy significantly.However,the increase of extrusion pass could enhance the tensile strength and elongation simultaneously,especially the strength.The degradation performance has been optimized effectively through increasing the extrusion ratio and extrusion pass. | Beining Du Ziyang Hu Jiali Wang Liyuan Sheng Hui Zhao Yufeng Zheng Tingfei Xi | 2020 | Bioactive Materials2020，5，2： | 3 |
| 4 | M5B3 Boride at the Grain Boundary of a Nickel-based Superalloy显示文摘The grain boundary microstructures of a heat-treated Ni-based cast superalloy IN792 were investigated. The results show that M_5B_3 boride precipitates at the grain boundary. A special orientation relationship between M_5B_3 phase and the matrix at one side of the grain boundary is found. At the same time, two M_5B_3 borides with different orientations could co-exist in a single M_5B_3 particle as an intergrowth besides existing alone, thus forming orientation relationship between the two M_5B_3 phases and matrix. This phenomenon could be attributed to the special orientation relationship between M_5B_3 phase and the matrix. | Beining Du Zhiwu Shi Jinxia Yang Zhaokuang Chu Chuanyong Cui Xiaofeng Sun Liyuan Sheng Yufeng Zheng | 2016 | Journal of Materials Science & Technology2016，32，3： | 2 |
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