多孔Ti6Al4V合金的准静态扭转变形行为
Quasi-static Torsional Deformation Behavior of Porous Ti6Al4V alloy.
作者信息
Balla Vamsi Krishna, Martinez Shantel, Rogoza Ben Tunberg, Livingston Chase, Venkateswaran Deepak, Bose Susmita, Bandyopadhyay Amit
机构信息
W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA.
出版信息
Mater Sci Eng C Mater Biol Appl. 2011 Jul 20;31(5):945-949. doi: 10.1016/j.msec.2011.02.016.
Laser processed Ti6Al4V alloy samples with total porosities of 0%, 10% and 20% have been subjected to torsional loading to determine mechanical properties and to understand the deformation behavior. The torsional yield strength and modulus of porous Ti alloy samples was found to be in the range of 185-332 MPa and 5.7-11 GPa, respectively. With an increase in the porosity both the strength and the modulus decreased, and at 20% porosity the torsional modulus of Ti6Al4V alloy was found to be very close to that of human cortical bone. Further, the experiments revealed clear strain hardening and ductile deformation in all the samples, which suggests that the inherent brittleness associated solid-state sintered porous materials can be completely eliminated via laser processing for load bearing metal implant applications.
总孔隙率分别为0%、10%和20%的激光加工Ti6Al4V合金样品已承受扭转载荷，以确定其力学性能并了解其变形行为。发现多孔钛合金样品的扭转屈服强度和模量分别在185-332MPa和5.7-11GPa范围内。随着孔隙率的增加，强度和模量均降低，并且在孔隙率为20%时，发现Ti6Al4V合金的扭转模量非常接近人类皮质骨的扭转模量。此外，实验表明所有样品均有明显的应变硬化和延性变形，这表明对于承重金属植入物应用而言，通过激光加工可以完全消除与固态烧结多孔材料相关的固有脆性。
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