Isostatic diffusion bonds were produced between Ti–6Al–4V and Super Alpha-2 sheet materials at temperatures of 920–940°C and pressures of 6–10 MPa. The diffusion bonds were evaluated using optical microscopy, lap shear testing, and scanning electron microscopy of the lap shear fracture faces. The results of X-ray microanalysis carried out on the bond interface region showed that substantial diffusion of niobium and molybdenum had occurred from the Super Alpha-2 to the Ti–6Al–4V. This caused a local suppression of the β transus in the Ti–6Al–4V alloy and on subsequent cooling the β phase decomposed to give a microstructure of fine acicular α phase and retained β phase in the bond region.
MST/3421
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References
1.
SARIRYS. M. L. and LIPSITTH. A.: Metall. Trans. A, 1977, 8A, 1543–1552.
2.
LIPSITTH. A.: in ‘High temperature ordered intermetallic alloys’, (ed. KochC. C.et al.), MRS Symp. Proc., Vol. 39, 351-364; 1985, Pittsburgh, PA, Materials Research Society.
3.
LIPSITTH. A., SHECHTMAND., and SCHAFRIKR. E.: Metall. Trans. A, 1980, 11A, 1369–1375.
4.
SASTRYS. M. L. and LIPSITTH. A.: in‘Titanium science and technology’, (ed. KimuraH. and 0. Izumi), Vol. 2, 1231-1243; 1980, Warrendale, PA, TMS.
5.
RIDLEYN., ISLAMM. F., and PILLINGJ.: in ‘Structural intermetal-lies’, (ed. R. Darolia et al.), 63-38; 1993, Warrendale, PA, TMS.
6.
PILLINGJ., RIDLEYN., and ISLAMM. F.: Mater. Sci. Eng. A, 1995, A205, 72-78.
7.
JUHASM. C., BAESLACKW. A., III, H. L. FRASER, P. THREADGILL, D. PHILLIPS and T. F. BRoDERicx: in ‘Titanium ‘92: science and technology’, (ed.FroesF. H. and CaplanI. L.), 1453-1460: 1993, Warrendale, PA, TMS.
