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首页> 外文期刊>Materials Science and Engineering >Microstructures and tensile properties of Ti_2AlNb and Mo-modified Ti_2AlNb alloys fabricated by hot isostatic pressing
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Microstructures and tensile properties of Ti_2AlNb and Mo-modified Ti_2AlNb alloys fabricated by hot isostatic pressing

机译：热等静压制备的Ti_2AlNb和Mo改性的Ti_2AlNb合金的组织和拉伸性能

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摘要

The Ti_2AlNb and Mo-modified Ti_2AlNb alloys were fabricated by hot isostatic pressing, and then underwent annealing treatment at 800 ℃ for 1, 2 and 3 h respectively. To evaluate the tensile properties of the two kinds of alloys, tensile tests were conducted at ambient temperature and 650 ℃ in this study. For the Ti_2AlNb alloy, the room-temperature ultimate tensile strength (UTS) was 700-900 MPa, and the highest elongation to failure (ε_f) reached 6.2% after aging for 2 h at 800 ℃. Since the Mo addition promoted the precipitation of the coarse B2+O colony structure near the grain boundary, the Mo-modified Ti2AlNb alloy exhibited decreased UTS and et at room temperature. As for the high-temperature performance of both the Ti_2AlNb and Mo-modified Ti_2AlNb alloys, the UTS reached approximately 700 MPa and the ε_f exceeded 3.0%. Meanwhile, the two kinds of alloys presented the same tendency that both the high-temperature UTS and ε_f increased firstly and then decreased as the aging time increased. Among them the specimens after aging at 800 ℃ for 2 h for both alloys acquired the highest UTS and ε_f. Moreover, the Mo-modified alloy exhibited a better high-temperature ductility than that at room temperature, which is associated with the B2↔0 phase transformation during the loading at 650 ℃. The Mo addition effectively refined the lath of the precipitates in the grain and the grain size of the matrix, and it induced abundant dislocations. Thus, the Mo-modified Ti_2AlNb alloy aged for 1 and 3 h exhibited superior high-temperature mechanical properties than those of the Ti_2AlNb alloy.
机译：通过热等静压法制备Ti_2AlNb和Mo改性的Ti_2AlNb合金，然后分别在800℃，1、2和3h进行退火处理。为了评估两种合金的拉伸性能，本研究在环境温度和650℃下进行了拉伸试验。对于Ti_2AlNb合金，室温极限拉伸强度（UTS）为700-900 MPa，在800℃时效2 h后，最高断裂伸长率（ε_f）达到6.2％。由于钼的添加促进了晶界附近的粗大B2 + O菌落结构的析出，因此，在室温下，钼改性的Ti2AlNb合金的UTS降低。关于Ti_2AlNb和Mo改性的Ti_2AlNb合金的高温性能，UTS达到约700 MPa，ε_f超过3.0％。同时，两种合金呈现出相同的趋势，即高温UTS和ε_f随时效时间的增加先升高后降低。其中，两种合金在800℃时效2 h后的试样均具有最高的UTS和ε_f。此外，Mo-改性合金具有比室温更好的高温延展性，这与在650℃加载过程中B2↔0相变有关。 Mo的添加有效地细化了晶粒中的析出板条和基体的晶粒尺寸，并且引起了大量的位错。因此，时效为1和3 h的Mo改性Ti_2AlNb合金具有比Ti_2AlNb合金更高的高温机械性能。

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