期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
Anisotropic Porous Ti6Al4V Alloys Fabricated by Diffusion Bonding: Adaption of Compressive Behavior to Cortical Bone Implant Applications
1
作者 Fuping Li Jinshan Li +1 位作者 Hongchao Kou Lian Zhou 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2016年第9期937-943,共7页
In this work, porous Ti6Al4V alloys with 30%–70% porosity for biomedical applications were fabricated by diffusion bonding of alloy meshes. Pore structure was characterized by Micro-CT and SEM. Compressive behavior i... In this work, porous Ti6Al4V alloys with 30%–70% porosity for biomedical applications were fabricated by diffusion bonding of alloy meshes. Pore structure was characterized by Micro-CT and SEM. Compressive behavior in the out-of-plane direction and biocompatibility with cortical bone were studied. The results reveal that the fabricated porous Ti6Al4V alloys possess anisotropic structure with square pores in the in-plane direction and elongated pores in the out-of-plane direction. The average pore size of porous Ti6Al4V alloys with 30%–70% porosity is in the range of 240–360 μm. By tailoring diffusion bonding temperature, aspect ratio of alloy meshes and porosity, porous Ti6Al4V alloys with different compressive properties can be obtained, for instance, Young’s modulus and yield stress in the ranges of 4–40 GPa and70–500 MPa, respectively. Yield stress of porous Ti6Al4V alloys fabricated by diffusion bonding is close to that of alloys fabricated by rapid prototyping, but higher than that of fabricated by powder sintering and space-holder method. Diffusion bonding temperature has some effects on the yield stress of porous Ti6Al4V alloys, but has a minor effect on the Young’s modulus. The relationship between compressive properties and relative density conforms well to the Gibson–Ashby model. The Young’s modulus is linear with the aspect ratio, while the yield stress is linear with the square of aspect ratio of alloy meshes. Porous Ti6Al4V alloys with 60%–70% porosity have potential for cortical bone implant applications. 展开更多
关键词 Porous biomaterials Titanium alloys Diffusion bonding Compressive behavior Bioadaption
Tribological Behavior of AlCoCrFeNi(Ti0.5) High Entropy Alloys under Oil and MACs Lubrication
2
作者 Yuan Yu Jun Wang +3 位作者 Jinshan Li Jun Yang Hongchao Kou Weimin Liu 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2016年第5期470-476,共7页
The tribological properties of AlCoCrFeNi and AlCoCrFeNiTi0.5 high entropy alloys under gear oil and multiply alkylated cyclopentanes(MACs)lubrication condition have been studied.The equiaxed crystal structure of Al... The tribological properties of AlCoCrFeNi and AlCoCrFeNiTi0.5 high entropy alloys under gear oil and multiply alkylated cyclopentanes(MACs)lubrication condition have been studied.The equiaxed crystal structure of AlCoCrFeNi alloy is obtained after heat-treatment.The AlCoCrFeNiTi0.5 alloy keeps dendrite structure.Under the gear oil with good lubrication action,AlCoCrFeNiTi0.5 alloy preserves better tribological properties than AlCoCrFeNi alloy.The delamination and crack behaviors tend to occur in the grain boundary of AlCoCrFeNi alloy and along the interdendrite region of AlCoCrFeNiTi0.5 alloy.Under the MACs with relatively poor lubrication action,the applied load slightly influences the wear behavior of AlCoCrFeNi alloy,but seriously impacts the wear mechanism of AlCoCrFeNiTi0.5 alloy.Compared with AlCoCrFeNi alloy,AlCoCrFeNiTi0.5 alloy keeps better wear-resistance at low applied load of 100 N,but preserves less wearresistance at high applied load of 200 N. 展开更多
关键词 feni合金 Mac 摩擦学行为 油润滑 摩擦学性能 晶体结构 润滑作用
Effects of small amount Ta on the characteristics ofthe Zr-Al-Ni-Cu-Ta bulk metallic glass 预览
3
作者 HongchaoKou XidongHui +3 位作者 XiongjunLiu XipingSong GuoliangChen KefuYao 《北京科技大学学报:英文版》 CSCD 2005年第3期 257-261,共5页
The effects of Ta on the characteristics of the Zr-base BMG (bulk metallic glass) were investigated. Zr55Al10Ni5Cu30-xTax (x=1, 2,4) bulk metallic glasses (BMGs) with 3.5 mm diameter and 70 mm length were successfully... The effects of Ta on the characteristics of the Zr-base BMG (bulk metallic glass) were investigated. Zr55Al10Ni5Cu30-xTax (x=1, 2,4) bulk metallic glasses (BMGs) with 3.5 mm diameter and 70 mm length were successfully prepared by using combined jet and copper mold casting. A small amount of Ta addition does not change the glass transition temperature, crystallization temperature,and supercooled liquid region obviously, but Ta promotes composition separation and two-stage crystallization. The stable crystalline phases include Zr2Ni, CuZr2, Al2Zr3 intermetallic compounds and Ta-rich solid solution after annealing the Zr-Al-Ni-Cu-Ta alloys at 753 K. Zr55Al10Ni5Cu30-xTax (x=1,2,4) bulk glassy alloys exhibit a better compressive strength. The stress-strain curve shows a zigzag feature, and the fracture surface shows intersecting of shear bands. It may correlate with the inhomogeneous feature of amorphous structure. 展开更多
关键词 Zr-Al-Ni-Cu-Ta合金 金属玻璃 显微结构 结晶温度
在线阅读 下载PDF
Effects of Ta addition on the microstructure and mechanical properties of Ti40Zr25Ni8Cu9Be18 amorphous alloy 预览
4
《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2007年第S1期31-35,共5页
The effects of Ta addition on the microstructure and mechanical properties of Ti40Zr25Ni8Cu9Be18 bulk amorphous alloy were investigated by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scan e... The effects of Ta addition on the microstructure and mechanical properties of Ti40Zr25Ni8Cu9Be18 bulk amorphous alloy were investigated by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scan electron microscopy (SEM) and compressive testing. As a result, the addition of Ta (0-8at%) prompted the successive precipitation of quasicrystalline phase, CuTi2 phase and bcc β-Ti solid solution. Additionally, the addition of less Ta content (3at%-5at%) led to the formation of amorphous ma- trix/nanoquasicrystal/CuTi2 complex phase structure; and nanoquasicrystals, as reinforcement precipitates, improved the fracture strength of Ti-Zr-Ni-Cu-Be-Ta alloys, which led to the high compressive fracture strength 1856 MPa of Ta5 alloy. With increasing Ta content (5at%-8at%), although the ductile dendritic β-Ti solid solution was precipitated, the strength and plasticity decreased to a great extent resulting from the growth of quasicrystalline phase and CuTi2 phase. 展开更多
关键词 Ti-based AMORPHOUS ALLOY BULK AMORPHOUS ALLOY MICROSTRUCTURE mechanical properties
在线阅读 下载PDF
Chemical short-range order domain in bulk amorphous alloy and the prediction of glass forming ability 被引量:1
5
作者 惠希东 姚可夫 +1 位作者 寇宏超 陈国良 《中国科学:技术科学英文版》 SCIE EI CAS 2003年第6期581-592,共12页
Short-range order domains of face central cubic Zr2Ni (F-Zr2Ni) and tetragonal Zr2Ni (T-Zr2Ni) type structure with a size about 1-3 nanometers were observed in bulk amorphous Zr52.5Cu17.9Ni14.6Al10Ti5 alloy by using H... Short-range order domains of face central cubic Zr2Ni (F-Zr2Ni) and tetragonal Zr2Ni (T-Zr2Ni) type structure with a size about 1-3 nanometers were observed in bulk amorphous Zr52.5Cu17.9Ni14.6Al10Ti5 alloy by using HREM and nano-beam electron diffraction technique. A new thermodynamic model was formulated based on the concept of chemical short-range order (SCRO). The molar fractions of CSRO and thermodynamic properties in Ni-Zr, Cu-Zr, Al-Zr, Al-Ni, Zr-Ni-Al and Zr-Ni-Cu were calculated. According to the principle of maximum the optimum glass forming ability (GFA) compositions were predicted in binary and ternary alloys. These results were proved to be valid by the experimental data of crystallizing activation energy, ΔTx and XRD patterns. The TTT curves of Zr-Ni-Cu alloys calculated based on CSRO model shows that the lowest critical cooling rate GFA is in the order of 100 K/s, which is close to the practical cooling rate for the preparation of Zr-based BMG alloys. 展开更多
关键词 bulk metallic glasses CHEMICAL SHORT-RANGE order domain glass forming ability thermodynamic model.
上一页 1 下一页 到第
使用帮助 返回顶部 意见反馈