Materials Metallurgical Engineering, Sunchon National University, Suncheon, 57922, Korea.
J Nanosci Nanotechnol. 2019 Jul 1;19(7):4333-4337. doi: 10.1166/jnn.2019.16273.
Ti-39Nb-6Zr-0.45Al alloy was developed for biological applications as exchangeable hard tissue. This alloy has very low elastic modulus, but lower strength than Ti-6Al-4V alloy. This study was performed for improving the strength by various heat treatments and microstructural characteristics and mechanical properties of Ti-39Nb-6Zr-0.45Al alloy were investigated. Heat treatments were conducted at 350 °C, 400 °C, 450 °C, 500 °C, 550 °C and 600 °C, followed by water quenching. Microstructures of Ti-39Nb-6Zr-0.45Al alloy showed two types of different features. One of the features was not visible for grains at low temperature heat conditions (350 °C, 400 °C and 450 °C), because of the effect of cold swaging. On the contrast, at high temperature conditions (500 °C, 550 °C and 600 °C), the grains were visible. Tensile properties had similar tendency to hardness properties under all low temperature conditions. The samples showed high strength and low elongation under low temperatures, but showed the opposite results under high temperature conditions. These results were due to thermal phases and secondary phases inside the matrix of this alloy. phases, which were precipitated under low temperature heat treatments, induce high strength and low elongation. In case of high temperature conditions, phases disappeared into the matrix and secondary phases with fine size appeared. oung's moduli of the samples under all the conditions were lower (about 60 GPa) than those of the as-swaged (about 70 GPa). Consequently, the heattreated Ti-39Nb-6Zr-0.45Al alloy had high strength and very low elastic modulus for biomedical applications.
Ti-39Nb-6Zr-0.45Al 合金被开发用于生物应用，作为可交换的硬组织。这种合金的弹性模量非常低，但强度低于 Ti-6Al-4V 合金。本研究通过各种热处理来提高强度，并研究了 Ti-39Nb-6Zr-0.45Al 合金的微观结构特征和力学性能。热处理在 350°C、400°C、450°C、500°C、550°C 和 600°C 下进行，随后进行水淬。Ti-39Nb-6Zr-0.45Al 合金的微观结构显示出两种不同的特征。其中一种特征在低温热处理条件（350°C、400°C 和 450°C）下由于冷挤压的影响而无法观察到晶粒。相比之下，在高温条件（500°C、550°C 和 600°C）下，晶粒是可见的。在所有低温条件下，拉伸性能与硬度性能具有相似的趋势。在低温下，样品表现出高强度和低伸长率，但在高温条件下则表现出相反的结果。这些结果是由于该合金基体中的热 相和次生 相。在低温热处理下沉淀的 相导致高强度和低伸长率。在高温条件下， 相消失在基体中，出现细小尺寸的次生 相。在所有条件下，样品的杨氏模量都较低（约 60GPa），低于原始挤压态的杨氏模量（约 70GPa）。因此，经过热处理的 Ti-39Nb-6Zr-0.45Al 合金具有高强度和非常低的弹性模量，适用于生物医学应用。
