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首页> 外文期刊>RSC Advances >Effects of solution treatment and aging on the microstructure, mechanical properties, and corrosion resistance of a β type Ti–Ta–Hf–Zr alloy
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Effects of solution treatment and aging on the microstructure, mechanical properties, and corrosion resistance of a β type Ti–Ta–Hf–Zr alloy

机译：固溶处理和时效对β型Ti–Ta–Hf–Zr合金的组织，力学性能和耐蚀性的影响

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Titanium and some of its alloys have become increasingly important for biomedical materials due to their high specific strength, good corrosion resistance, and excellent biocompatibility compared to the biomedical stainless steels and cobalt–chromium based alloys. In this study, a β type TTHZ alloy (Ti–40Ta–22Hf–11.7Zr) was prepared with the cold-crucible levitation technique. The corrosion behavior and the effects of solution treatment (ST) and aging on the microstructures and mechanical properties of the TTHZ alloy were investigated using electrochemical analysis, XPS (X-ray photoelectron spectroscopy), OM (optical microscopy), XRD (X-ray diffractometry), TEM (transmission electron microscopy) and compressive testing. The results indicate that the as-cast alloy exhibited a β + ωath microstructure, which transformed into a single β phase after ST at 900 °C for 1 h. The β phase further transformed into β + α′′, β + α′′ + α, and β + α + ωiso after aging for 15 min, 1.5 h, 12 h and 24 h, respectively. The different phases of the TTHZ alloy showed significantly different mechanical properties and corrosion behavior. The solution-treated TTHZ alloy exhibited a compressive yield strength of approximately 1018 MPa and an excellent compressive strain as no fracturing was observed; and the compression tests were stopped at a compressive strain of ～70%. The TTHZ alloy after solution treatment plus aging exhibited an increase in the compressive yield strength with a decreased compressive strain. The solution-treated TTHZ alloy exhibited a single β phase with the highest corrosion resistance, compared to the as-cast and solution-treated alloy, followed by aging samples. The open-circuit potential (OCP) analysis indicates that the corrosion resistance of the as-cast TTHZ alloy was superior to those of both CP-Ti and Ti6Al4V.
机译：与生物医学不锈钢和钴铬基合金相比，钛及其某些合金由于其高比强度，良好的耐腐蚀性和出色的生物相容性，对生物医学材料变得越来越重要。在这项研究中，使用冷坩埚悬浮技术制备了一种β型TTHZ合金（Ti–40Ta–22Hf–11.7Zr）。使用电化学分析，XPS（X射线光电子能谱），OM（光学显微镜），XRD（X射线）研究了TTHZ合金的腐蚀行为以及固溶处理和时效对TTHZ合金的组织和力学性能的影响。衍射法），TEM（透射电子显微镜）和压缩测试。结果表明，铸态合金表现出β+ω ath 的微观结构，ST在900°C下热处理1 h后转变为单一的β相。老化15分钟，1.5小时后，β相进一步转变为β+α''，β+α''+α和β+α+ω iso ，分别为12小时和24小时。 TTHZ合金的不同相显示出明显不同的机械性能和腐蚀行为。固溶处理的TTHZ合金的压缩屈服强度约为1018 MPa，并且由于未观察到断裂而具有优异的压缩应变。压缩试验在约70％的压缩应变下停止。固溶处理和时效处理后的TTHZ合金的抗压屈服强度增加，而压缩应变降低。与铸态和固溶处理的合金相比，固溶处理的TTHZ合金表现出最高的耐腐蚀性的单一β相，随后是时效样品。开路电势（OCP）分析表明，铸态TTHZ合金的耐蚀性优于CP-Ti和Ti6Al4V。

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