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首页> 外文期刊>Materials Science and Engineering >Microstructure evolution and high-temperature tensile behavior of the powder extruded 2.5 vol% TiBw/TA15 composites
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Microstructure evolution and high-temperature tensile behavior of the powder extruded 2.5 vol% TiBw/TA15 composites

机译：粉末挤压2.5％（体积）TiBw / TA15复合材料的微观组织演变和高温拉伸行为

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摘要

In this paper, 2.5 vol% TiBw/TA15 composites were fabricated by low-energy milling and subsequent powder extrusion. After low-energy milling process, the fine TiB2 powders were adhered on the surface of the spherical TA15 powders. Next, the blended powders were extruded at 1100 degrees C with extrusion ratio of 10:1. The Widmanstatten alpha + beta microstructure with thickness of 550-620 run in alpha phase was obtained and the strong (0001)(alpha)//ED and (101)(alpha)//ED texture was formed after powder extrusion. The TiB whiskers (TiBw) twisted along the extrusion direction and led to the 'wall' structure. High-temperature tensile behavior of this studied composites was investigated at 800-950 degrees C with strain rate of 0.001-0.1 s(-1). According to the stress-strain curves, the activation energy (Q) was calculated to be 325 kJ mol(-1), higher than the TA15 matrix, which is due to the combined effect of phase morphology, extrusion texture and TiBw reinforcements. In addition, the tensile strain has effect on microstructure evolution. Static spheroidizing has been processed in the grip area of tensile sample. As the tensile strain increased, the volume fraction of and the average grain size a phase decreased. Moreover, voids nearby the TiBw reinforcements were observed due to the incoordination deformation between TiBw and TA15 matrix.
机译：本文通过低能碾磨和随后的粉末挤出制备了2.5％（体积）的TiBw / TA15复合材料。经过低能研磨后，TiB2细粉粘附在球形TA15粉末的表面。接下来，将混合的粉末在1100℃下以10∶1的挤出比挤出。获得了在相中厚度为550-620的Widmanstattenα+β微结构，粉末挤出后形成了牢固的（0001）α// ED和（101）α// ED织构。 TiB晶须（TiBw）沿挤压方向扭曲并形成“壁”结构。在800-950摄氏度和0.001-0.1 s（-1）的应变速率下研究了这种复合材料的高温拉伸行为。根据应力-应变曲线，计算出的活化能（Q）为325 kJ mol（-1），高于TA15基体，这是由于相形态，挤压织构和TiBw增强材料共同作用的结果。另外，拉伸应变对组织的演变有影响。静态球化处理已在拉伸样品的抓握区域进行。随着拉伸应变的增加，α相的体积分数和平均晶粒尺寸减小。此外，由于TiBw和TA15基体之间的不协调变形，观察到TiBw增强材料附近的空隙。

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