Analysis of a beryllium-copper diffusion joint after HHF test

[摘要] The development of beryllium-copper joints which can withstand relevant ITER divertor conditions is one of the important tasks at the present time. One of the main problems associated with these joints is the intermetallic layers. The strength and life of these joints significantly depend on the width and contents of the intermetallic layers. The objective of this work is to study the diffusion joint of TGP-56 beryllium to OFHC copper after thermal response and thermocyclic rests with a beryllium-copper mock-up. The HHF test was performed on the e-beam facility (EBTS, SNLA), The following methods were used for analysis: roentgenographic analysis, X-ray spectrum analysis and fracture analysis. During the investigation the following studies were undertaken: the analysis of the diffusion boundary layer, which was obtained at the cross-section of one of the tiles, the analysis of the debonded surfaces of several beryllium tiles and corresponding copper parts and the analysis of the upper surface of one of the tiles after HHF tests. The joint roentgenographic and element analyses revealed the following phases in the diffusion zone: Cu2Be (similar to 170 mu m), CuBe (similar to 30 mu m), CuBe2 (similar to 1 mu m) and a solid solution of copper in beryllium. The phases Cu2Be, CuBe and the solid solution of copper in beryllium were detected by the quantitative microanalysis and the phases CuBe, CuBe2 and CuBe, by the roentgenographic analysis, The fracture (origin) is located in the central part of the tiles. This crack was caused by residual stresses and thermal fatigue testing. This analysis provides important data on the joint quality and may be used for all types of joints used for ITER applications.

[发布日期] 1996-10-01

[效力级别]  Proceedings Paper