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首页> 外文期刊>Materials Science and Engineering >Microstructure evolution, B2 grain growth kinetics and fracture behaviour of a powder metallurgy Ti-22Al-25Nb alloy fabricated by spark plasma sintering
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Microstructure evolution, B2 grain growth kinetics and fracture behaviour of a powder metallurgy Ti-22Al-25Nb alloy fabricated by spark plasma sintering

机译：火花等离子体烧结制备的粉末冶金Ti-22Al-25Nb合金的组织演变，B2晶粒长大动力学和断裂行为

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摘要

A powder metallurgy (P/M) Ti-22Al-25Nb (at%) alloy was prepared by spark plasma sintering of pre-alloyed powders at 1000 degrees C/80 MPa/10 min. The solution treatments of the P/M Ti-22Al-25Nb alloy were conducted at a temperature range of 940-1030 degrees C at 30 degrees C intervals and holding times of 10 min, 30 min, 60 min, and 120 min. The effects of the solution temperature and the holding time on the microstructure evolution, B2 grain growth behavior, phase transition, tensile mechanical properties, and fracture behavior of the P/M Ti-22Al-25Nb alloy were systematically evaluated using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction, and tensile tests. The results indicated that the microstructure and mechanical properties were closely linked to the solution temperature and the holding time. The effect of the holding time and the solution temperature on the B2 grain growth is well described by Beck's equation and Hillert's equation, respectively. The tensile tests showed that the tensile properties of the solution-treated P/M Ti-22Al-25Nb alloy were mainly affected by the number of O phases in the interior of the B2 grains and the phase transition degree of the alpha(2) phase at the grain boundary. The P/M Ti-22Al-25Nb alloy solution-treated at 940 degrees C/10 min exhibited the best mechanical properties at room temperature with a yield strength, tensile strength, and elongation of 867.8 MPa, 949.5 MPa, and 7.4%, respectively. A phase transition model of the alpha(2) phase was established. In addition, a tensile fracture model of the P/M Ti-22Al-25Nb alloy solution-treated under different conditions was established.
机译：通过在1000摄氏度/ 80兆帕/ 10分钟的条件下对预合金粉末进行火花等离子体烧结，制备了粉末冶金（P / M）Ti-22Al-25Nb（原子％）合金。 P / M Ti-22Al-25Nb合金的固溶处理是在940-1030摄氏度的温度范围内以30摄氏度的间隔进行的，保温时间为10分钟，30分钟，60分钟和120分钟。使用光学显微镜（OM）系统地评估了固溶温度和保温时间对P / M Ti-22Al-25Nb合金的组织演变，B2晶粒生长行为，相变，拉伸力学性能和断裂行为的影响。 ，扫描电子显微镜（SEM），X射线衍射和拉伸试验。结果表明，组织和力学性能与固溶温度和保温时间密切相关。贝克时间方程和希勒特方程分别很好地描述了保温时间和固溶温度对B2晶粒长大的影响。拉伸试验表明，固溶处理的P / M Ti-22Al-25Nb合金的拉伸性能主要受B2晶粒内部O相的数量和α（2）相的相变度的影响。在晶界。在940℃/ 10 min固溶处理的P / M Ti-22Al-25Nb合金在室温下表现出最佳的机械性能，屈服强度，拉伸强度和伸长率分别为867.8 MPa，949.5 MPa和7.4％。 。建立了alpha（2）相的相变模型。此外，建立了在不同条件下固溶处理的P / M Ti-22Al-25Nb合金的拉伸断裂模型。

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