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您的检索式：作者名="R.Z.Valiev"
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| 1 | Nanocrystalline Ti49.2Ni50.8 shape memory alloy as orthopaedic implant material with better performance显示文摘Ti Ni alloys, with their unique shape memory effects and super elastic properties, occupy an indispensable place in the family of metallic biomaterials. In the past years, surface treatment is the main technique to improve the bioinert nature of microcrystalline Ti Ni alloys and inhibit on the release of toxic nickel ions to obtain excellent osteogenesis and osseointegration function. In the present study, nanocrystalline Ti49.2Ni50.8 alloy has been fabricated via equal channel angular pressing(ECAP), and the in vitro and in vivo studies revealed that it had enhanced cell viability, adhesion, proliferation, ALP(Alkaline phosphatase)activity and mineralization, and increased periphery thickness of new bone, in comparison to the commercial coarse-grained counterpart. These findings indicate that the reduction of grain size is beneficial to increasing the biocompatibility of Ti49.2Ni50.8 shape memory alloy. | H.F.Li F.L.Nie Y.F.Zheng Y.Cheng S.C.Wei R.Z.Valiev | 2019 | Journal of Materials Science & Technology2019，35，10： | 4 |
| 2 | In vitro and in vivo studies on pure Mg, Mg-1Ca and Mg-2Sr alloys processed by equal channel angular pressing显示文摘In the present work,the biomedical as-cast pure Mg,Mg–1 Ca and Mg–2 Sr alloys were processed with equal channel angular pressing(ECAP)technique to develop ultrafine microstructure within the materials,and their microstructures,mechanical properties,degradation behavior,cytocompatibility in vitro and biocompatibility in vivo were studied comprehensively.Finer-gained microstructures and improved mechanical properties of these three materials after ECAP were confirmed compared to their as-cast counterparts.Moreover,after ECAP the degradation rate of pure Mg was increased while that of Mg–1 Ca or Mg–2 Sr alloys decreased compared to the ascast counterparts.Additionally,good in vitro cytocompatibility and in vivo biocompatibility of these three materials were revealed by cell cultural tests using osteoblastic MC3 T3-E1 and human mesenchymal stem cells(h MSC)and in vivo animal tests at the lateral epicondyle of SD-rats’femur.This study offers an alternative powerful avenue to achieve good comprehensive properties of magnesium-based biodegradable metals.It might also help to extend the applied range of magnesium-based biodegradable metals in orthopedic field. | Wenting Li Yunong Shen Jie Shen Danni Shen Xiao Liu Yufeng Zheng Kelvin W.K.Yeung Shaokang Guan Olga B.Kulyasova R.Z.Valiev | 2020 | Nano Materials Science2020，2，1： | 1 |
| 3 | Nanostructured Ti29.7Ni50.3Hf20 high temperature shape memory alloy processed by high-pressure torsion显示文摘High-pressure torsion(HPT)processing under a pressure of 6.0 GPa was applied to Ti29.7Ni50.3Hf20(at.%)alloy.Two types of structure were observed after HPT with 3 revolutions:first one is the mixture of amorphous phase and retained nanocrystalline;second is the alternating bands of amorphous phase and high defect density crystalline.As a result,post deformation annealing(PDA)at 500-700℃leads to the non-uniform distribution of martensite and parent phase grains.The grains of martensite are twice larger compared to that of parent phase.The nanocrystalline and ultrafine grains form after annealing at 500-600℃and 700℃,respectively.The twinning mechanism does not change with the reduction of martensitic grains up to^35 nm.The relationship between strength and grain size in Ti29.7Ni50.3Hf20 alloy obeys the classical Hall-Petch relationship with a coefficient of 10.80±0.39 GPa nm^1/2. | A.Shuitcev D.V.Gunderov B.Sun L.Li R.Z.Valiev Y.X.Tong | 2020 | Journal of Materials Science & Technology2020，52，17： | 0 |
| 4 | 急剧塑性变形工艺加工超细晶粒合金的增强超塑性显示文摘纳米晶合金-掺硼Ni_3Al金属间化合物和Al合金1420(Al-5.5%Mg-2.2%Li-0.12%Zr),以及亚微米晶铝合金1420经过了两种急剧塑性变形法的处理,即通过施加大压力状态下的扭曲应变的加工和等路径斜向挤压加工(ECAP)。这样加工的超细晶粒(UFG)合金表现出了在相对低的温度和/或高应变速率条件下的增强超塑性。本文根据透射电子显微镜/高分辨率电子显微镜(TEM/HREM)的分析结果讨论了超细晶粒合金超塑性行为的特点以及获得增强超塑性的条件。 | R.Z.valiev R.K.Islamgaliev 钱玉麟 | 2001 | 上海钢研2001，，3： | 0 |
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