Dislocation mechanisms in Al-rich Al-Li alloys

The Effect of Alloying Elements on the Structural Stability, Mechanical Properties, and Debye Temperature of Al3Li: A First-Principles Study

“…The metastable Al 3 Li (δ′) precipitates has an important influence on the mechanical properties of Al–Li based alloys [3,4]. The δ′ phase is highly ordered with an L1 2 structure and forms as spheres possessing a cube–cube orientation relationship with matrix [5].…”

“…Lightweight structural materials such as the Al–Li based alloys have excellent comprehensive performance, such as low density, good corrosion resistance, and high elastic modulus [ 1 , 2 ], and it is the basic reason why Al–Li based alloys are so widely used in aviation and aerospace field. The metastable Al 3 Li (δ′) precipitates has an important influence on the mechanical properties of Al–Li based alloys [ 3 , 4 ]. The δ′ phase is highly ordered with an L1 2 structure and forms as spheres possessing a cube–cube orientation relationship with matrix [ 5 ].…”

In situtransmission electron microscopy observations of dislocation processes in δ′-strengthened aluminium-lithium alloys

“…There also the specimen designation S x / y is defined: x x lOOf, y M r in nanometres. The values of r and f listed in table 1 for specimens S5/7 and S12/10 are believed to be more accurate than those published by Rosner et al (1997). Since r for specimen S6/5 is rather small, the f and r values quoted are only approximate.…”

“…Analysis (1) has been presented elsewhere (Rosner et al 1997): q = 138 MPa and T~ = 79MPa (Kalogeridis et al 1999a). In the calculation of q the line tension of screw dislocations had been inserted.…”