Processing of a TiPd-SMA fiber Ti matrix composite and its microstructure and mechanical properties

Ti-Pd-Ni-W SMA fiber/Titanium matrix composites were produced by sheath-rolling. A thirty mu m thick homogeneous reaction layer was formed in the vicinity of the interface between the fiber and the matrix. The interfacial layer between fiber and matrix consists of three different intermetallic compounds. Young's modulous of the fiber increased with increasing temperature above the A(s) point. The yield strength of the composites increased with increasing temperature above the A(f) point. This increase of yield strength would be due to residual compressive stress by fiber's shape memory effect. Ductile fracture patterns were observed on the fracture surface of the interfacial layer between the fiber and the matrix. This interfacial layer would be effective for stress conductivity.