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Mechanical properties of porous metastable beta Ti-Nb-Zr alloys for biomedical applications

机译：用于生物医学的多孔亚稳态βTi-Nb-Zr合金的力学性能

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For this study, Ti\u2013(20\u201322)Nb\u2013(5\u20136)Zr (at percent) ingots were manufactured by vacuum and argon arc melting. The obtained ingots were divided into two batches: the first subjected to cold rolling (CR) from 30 to 85 percent of thickness reduction, and subsequent annealing in the 450\u2013600 \ub0C temperature range (1 h). Regardless of the CR intensity, Ti\u2013Nb\u2013Zr samples subjected to 600 \ub0C annealing showed the highest fatigue resistance during room-temperature cumulative cycling due to the stress-induced martensitic transformation occurring in the polygonized dislocation substructure (average subgrain size \u223c 100 nm). The second batch was atomized to produce 100-\u3bcm-size powders in order to manufacture open-cell porous material (cell size vary from 136 to 561 \u3bcm) of 46 percent porosity by means of powder metallurgy using a polymer-based foaming process. Tensile, compression and bending testing were performed at RT on foam samples annealed at 450\u2013600 \ub0C (1 h). Results indicated that Young's modulus of Ti\u2013Nb\u2013Zr foams significantly decreases as compared to the as-sintered material: when annealing temperature increases from 450 to 600 \ub0C, Young's modulus decreases from 10 \ub1 2 GPa to 6 \ub1 1 GPa. Under the same testing conditions, Ti-CP foams produced by the same technology and having similar porosity remain fairly insensible to post-sintering annealing.
机译：对于此研究，通过真空和氩弧熔化生产了Ti \ u2013（20 \ u201322）Nb \ u2013（5 \ u20136）Zr（原子百分比）铸锭。将获得的铸锭分为两批：第一批进行冷轧（CR），将其厚度减少30％至85％，然后在450℃温度范围内进行退火（1 h）。无论CR强度如何，经过600 \ ub0C退火的Ti \ u2013Nb \ u2013Zr样品在室温累积循环中均表现出最高的抗疲劳性，这是由于应力诱导的马氏体相变发生在多边形位错子结构中（平均子晶粒尺寸为100）纳米）。第二批被雾化以生产100微米级的粉末，以便利用基于聚合物的发泡工艺通过粉末冶金来制造孔隙率为46％的开孔多孔材料（单元尺寸从136到561微米级）。 。在室温下对在450 \ u2013600 \ ub0C（1 h）退火的泡沫样品进行拉伸，压缩和弯曲测试。结果表明，与烧结材料相比，Ti \ u2013Nb \ u2013Zr泡沫材料的杨氏模量显着降低：当退火温度从450升高至600 \ ub0C时，杨氏模量从10 \ ub1 2 GPa降低至6 \ ub1 1 GPa。在相同的测试条件下，采用相同技术生产且具有相似孔隙率的Ti-CP泡沫对于烧结后退火仍然相当不敏感。

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