Microstructures, Martensitic Transformation, and Mechanical Behavior of Rapidly Solidified Ti-Ni-Hf and Ti-Ni-Si Shape Memory Alloys

作者：Han, X. L.; Song, K. K.^*; Zhang, L. M.; Xing, H.; Sarac, B.; Spieckermann, F.; Maity, T.; Muehlbacher, M.; Wang, L.; Kaban, I.; Eckert, J.

来源：Journal of Materials Engineering and Performance, 2018, 27(3): 1005-1015.

DOI：10.1007/s11665-018-3209-x

• martensitic phase transformation
• mechanical properties
• microstructures
• rapid solidification

In this work, the microstructure and mechanical properties of rapidly solidified Ti50-x/2Ni50-x/2Hf (x) (x = 0, 2, 4, 6, 8, 10, and 12 at.%) and Ti50-y/2Ni50-y/2Si (y) (y = 1, 2, 3, 5, 7, and 10 at.%) shape memory alloys (SMAs) were investigated. The sequence of the phase formation and transformations in dependence on the chemical composition is established. Rapidly solidified Ti-Ni-Hf or Ti-Ni-Si SMAs are found to show relatively high yield strength and large ductility for specific Hf or Si concentrations, which is due to the gradual disappearance of the phase transformation from austenite to twinned martensite and the predominance of the phase transformation from twinned martensite to detwinned martensite during deformation as well as to the refinement of dendrites and the precipitation of brittle intermetallic compounds.

• 出版日期2018-3
• 单位西北工业大学; 山东大学