BPOp has attracted many interests in the past years because of
its interesting electronic properties [13,14]. Until now, the primary
studies were focused on the crystal structure and doping behavior
of a number of superconducting systems from the host lattice of
BPOp, and the study on the mechanical properties about this compound
has not carried out. In our investigation, we measured the
Young’s modulus properties of BPOp, 116 GPa, by means of nanoindentation.
On the assumption that there is no reaction between
Al and BPOp, from the rule of mixture, the elastic modulus of the
composite was evaluated to be 74.6 GPa. It is well agreement with
the experimental result. However, there exists quite lots of Pb particles
according to XRD and microstructure results, which has relative
low elastic modulus (17 GPa). Thus, this research work
indicated the compound Ba3Al2O6 may have higher elastic modulus,
and the increase of mechanical properties for the composite
might result from hard phase compound Ba3Al2O6 and BPOp. In
addition, Pb nanoparticles might act as a kind of strengthening
phase rather than coarse inclusion. Many reports already demonstrate
the Pb particles exhibit a cube–cube orientation relationship
with surrounding Al matrix ({111}Al//{111}Pb and Al//
Pb) [15–17]. Therefore, we take the Pb particles to be spherical
in form and of mean radius r. When a dislocation penetrates
the particles, they are sheared as shown in Fig. 5. A new surface
is produced during the process of shear, elevating free energy of
the system, as a result, causing strengthening effect [17,18]
BPOp has attracted many interests in the past years because of
its interesting electronic properties [13,14]. Until now, the primary
studies were focused on the crystal structure and doping behavior
of a number of superconducting systems from the host lattice of
BPOp, and the study on the mechanical properties about this compound
has not carried out. In our investigation, we measured the
Young’s modulus properties of BPOp, 116 GPa, by means of nanoindentation.
On the assumption that there is no reaction between
Al and BPOp, from the rule of mixture, the elastic modulus of the
composite was evaluated to be 74.6 GPa. It is well agreement with
the experimental result. However, there exists quite lots of Pb particles
according to XRD and microstructure results, which has relative
low elastic modulus (17 GPa). Thus, this research work
indicated the compound Ba3Al2O6 may have higher elastic modulus,
and the increase of mechanical properties for the composite
might result from hard phase compound Ba3Al2O6 and BPOp. In
addition, Pb nanoparticles might act as a kind of strengthening
phase rather than coarse inclusion. Many reports already demonstrate
the Pb particles exhibit a cube–cube orientation relationship
with surrounding Al matrix ({111}Al//{111}Pb and <110>Al//
<110>Pb) [15–17]. Therefore, we take the Pb particles to be spherical
in form and of mean radius r. When a dislocation penetrates
the particles, they are sheared as shown in Fig. 5. A new surface
is produced during the process of shear, elevating free energy of
the system, as a result, causing strengthening effect [17,18]
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