Erlin ZHANG
,
Yunxue JIN
,
Songyan ZENG
,
Zhaojun ZHU
材料科学技术（英文）
TiB reinforced titanium composites have been successfully synthesized by adding the Al/TiB2 master alloy into titanium alloy. The phase constituent and the microstructure have been studied by XRD and SEM. Compared with the standard values, the lattice parameter of TiB calculated from the XRD pattern indicates that the synthesized TiB is of prefect crystal structure. The microstructure has shown that high aspect ratio fibrous TiB has been found, which homogeneously distribute in the matrix in a random way. The size is about 100 μm in length, less than 2.5 μm in diameter and the aspect ratio is greater than 40. Deep etched microstructures show that some coarse hollow TiB corresponding to primary TiB are also formed with smooth and flat surface and random transverse section. The size is about 100 μm in length and greater than 10 mum in diameter. The solidification process has also been analyzed.
关键词:
Bo YANG
,
Erlin ZHANG
,
Yunxue JIN
,
Zhaojun ZHU
,
Songyan ZENG
材料科学技术（英文）
TiC reinforced titanium composites has been produced with different Al content and C content by XDTM. The results have shown that TiC particles are of two different morphologies f coarse dendritical primary TiC and short bar-shape eutectic TiC. Al content has great effects on the morphology of TiC. With the increasing of Al content, the morphology of primary TiC changes from coarse developed dendrite into short bar-shape or plate--shape TiC with 35%Al. Meanwhile, the structure of the matrix changes from single Ti to Ti and Ti2Al and to Ti3Al. However, the C content has no influence on the microstructure of matrix. When the C content is less than 1.2%, the dendrite TiC disappears and only short bar-shape or plate-shape TiC exists in the composites. In addition, the effect of heat of heat treatment on the morphology of TiC has also studied.
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