The role of twinning in the cavitation erosion of cobalt single crystals期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

The role of twinning in the cavitation erosion of cobalt single crystals

Authors:	S Vaidya S Mahajan C M Preece

Affiliation:	(1) Bell Laboratories, 07974 Murray Hill, NJ

Abstract:	The deformation characteristics contributing to the superior cavitation erosion properties of HCP cobalt single crystals have been determined. Results indicate that its erosion response is highly orientation sensitive. A homogeneous distribution of $\left\langle {2\overline {11} 0} \right\rangle$ and $\left\langle {2\overline {11} 3} \right\rangle$ glide occurs in {0110} crystals, whereas slip in the (0001) crystals is much more heterogeneous and consists mainly of $\left\langle {0\overline 1 10} \right\rangle$ dislocations. Continued exposure to cavitation nucleates a large number of twins, predominantly on the $\left\langle {2\overline {11} 0} \right\rangle$ and $\left\langle {11\overline 2 1} \right\rangle$ planes in the $\left\langle {10\overline 1 2} \right\rangle$ and (0001) crystals respectively. The former twins are finer and more needle-like than the latter. The $\left\langle {0\overline 1 10} \right\rangle$ crystals are also significantly more erosion resistant than the (0001) crystals. The twin density increases continuously with cavitation exposure until a dense network of twins spans the entire exposed area. This fine-scale twinning is considered responsible for the superior erosion resistance of the metal.

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