Enhanced Mechanical Properties of Metallic Glass Thin Films via Modification of Structural Heterogeneity.

The structure of CuZr and CoTaB metallic glass thin films (MGTF) was effectively tailored via various applied substrate temperatures by means of the magnetron sputtering technology. Obviously enhanced hardness and elastic modulus are achieved by different compositional MGTFs by increasing the substrate temperature. Compared with the CuZr MGTFs, the CoTaB MGTF deposited at 473 K displays the smaller strain-rate sensitivity exponent, , and a weaker spectrum intensity based on the nanoindentation creep test, suggesting its better creep resistance.

Effect of Fe Addition on Microstructure and Mechanical Properties of As-cast TiNi Alloy.

Effect of Fe addition on microstructure and mechanical properties of as-cast TiNi alloy were investigated. The experimental results shows the microstructures of TiNiFe and TiNiFe alloys are mainly composed of TiNi matrix phase (body-centered cubic, BCC), TiNi and NiTi phases; the microstructure of TiNiFe alloy is mainly composed of BCC TiNi, TiNi, NiTi, and NiTi phases; the microstructure of the TiNiFe alloy is mainly composed of TiNi, TiNi and NiTi phases. The NiTi nanocrystalline precipitates at the adjacent position of NiTi phase.

Effect of Heat Treatment Temperature on Martensitic Transformation and Superelasticity of the TiNi Shape Memory Alloy.

The martensitic transformation and superelasticity of TiNi shape memory alloy heat-treatment at different temperatures were investigated. The experimental results show that the microstructures of as-cast and heat-treated (723 K) Ni-rich TiNi samples prepared by rapidly-solidified technology are composed of B2 TiNi phase, and TiNi and TiNi phases; the microstructures of heat-treated TiNi samples at 773 and 823 K are composed of B2 TiNi phase, and of B2 TiNi and TiNi phases, respectively. The martensitic transformation of as-cast TiNi alloy is three-stage, A→R→M and R→M transformation during cooling, and two-stage, M→R→A transformation during heating.