Full
Outline
Equiatomic TiNi shape memory alloys reinforced by TiB particle are prepared via vacuum arc melting by introducing MoB powder particles with varying mass fractions. The influences of in situ reaction products on the microstructure， mechanical properties， and shape memory effect of the alloy are systematically investigated. Moreover， the mechanical properties are further optimized by multi-pass cold-rolling and subsequent annealing treatment. The experimental results indicate that the alloy exhibits optimal comprehensive mechanical properties with tensile strength increasing from 461 MPa to 522 MPa and elongation after fracture rising from 4.5% to 8.6%， when the MoB addition amount is 0.1%（mass fraction）. In addition， the alloy maintains a high shape recovery rate of 93.3% under 3% pre-compression strain.The mechanical properties of the alloy are further improved subjected to cold rolling and annealing treatment. For instance， the tensile strength and elongation after fracture respectively increase to 757 MPa and 18.8% after 5 passes of cold-rolling （75% deformation） and annealing， representing increases of 45% and 118.6% compared to the unrolled alloy. Microstructural analysis reveals that the Ti2Ni precipitate particles are severely fragmented during the rolling process， resulting in reduced particle size. Recovery and recrystallization take place in the deformation zones， with the matrix exhibiting submicron grains， nanoscale martensitic structures， and nanotwins. High-density dislocations are observed both within the matrix and surrounding the TiB particles. Finally， the improved mechanism of the comprehensive mechanical properties of the TiNi alloy is systematically discussed through the evolution of microstructure.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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