DIFFICULTIES IN GRAIN REFINING ALUMINUM LITHIUM ALLOYS USING COMMERCIAL Al-Ti AND Al-Ti-Bor MASTER ALLOYS L.C. LABARRE, R.S. JAMES, J.J. WITTERS, R.J. O'MALLEY et M.R. EMPTAGE J. Phys. Colloques, 48 C3 (1987) C3-93-C3-102 DOI: 10.1051/jphyscol:1987311