No abstract

The application of rapidly solidified amorphous metal ribbons as continuous reinforcements for thermoplastic composites is examined. The metallic glass alloy Fe40Ni40B20 (at. percent), with good stiffness, strength, and magnetic properties, was selected as the ribbon alloy. The mechanical properties of the ribbons (elastic modulus and fracture strength) were determined by tensile testing under plane‐stress conditions. The continuous FE40Ni40B20 amorphous ribbons were incorporated as reinforcements into a polypropylene (thermoplastic) matrix. To evaluate the quality of the composites formed, ribbon pullout tests were performed to measure the interfacial ribbon/matrix bond strength. It was noted that increasing the hot compaction pressure during fabrication and the surface texture of the ribbons by etching significantly improved the interfacial shear strength between the ribbon and thermoplastic matrix.

Des rubans discontinus de métal rapidement solidifiés d'un alliage de Fe^Ni^-B^ç furent incoporés dans une matrice de polypropylène. La qualité de l'adhésion à l'interface fut examinée par deux moyens, soit en retirant des rubans partiellement noyés dans la matrice, soiten étudiant les surfaces des rubans au microscope électronique à balayage. Des rubans discontinus d'un alliage de Ni 75 AI 2 "B.Zr^ furent coulés dans uns matrice d'aluminium. Le microscope électronique à balayage ainsi que l'analise au KEVEX furent employés pour étudier la zone de l'interface formée autour du ruban.

Composite specimens with polypropylene matrix containing up to 1.8 percent volume fraction of amorphous metallic ribbons with the interfacial shear strength ∼0.7 MPa were fabricated by hot compaction under 10 MPa pressure. Their tensile properties and fracture behavior were investigated. It is found that within the investigated range of the volume fraction of reinforecement the composite fracture strength is close to the rule of mixtures predictions. Two types of fracture, matrix and ribbon controlled, are observed. The experimental values of the composite elastic modulus are also close to the rule of mixtures predictions.