The elastic moduli and logarithmic decrement of Fe-Co alloys are measured over the entire concentration range upon quenching from 850°C. The temperature dependences of these properties of some of these alloys and commercial FeCo-2V permendur are also measured. The bulk modulus and the Poisson ratio are calculated, and the plasticities of the alloys are estimated at 20°C (293 K) and higher temperatures. The socalled 550°C anomaly in the temperature dependences of the properties is discussed.

Elastic properties of materials and their changes with temperature are important for their applications in engineering. In the present study the influence of phase composition and temperature of AISI 4130 alloy on Young’s modulus (E_d), shear modulus (G_d), and damping (Q⁻¹) was carried out by the impulse excitation technique (IET). The material characterization was performed using confocal microscopy, XRD, SEM, HV, and dilatometry. A stable structure, composed of ferrite (BCC) and pearlite (α-Fe + Fe₃C), was obtained by annealing. Metastable structure of martensite (BCT) was obtained by quenching. The E_d, G_d, and Q⁻¹ were measured by varying the temperature from RT to 900 °C. The values of E_d and G_d, at RT, were determined as 201.5 and 79.2 GPa (annealed) and 190.13 and 76.5 GPa (quenched), respectively. In the annealed steel, the values E_d and G_d decrease linearly on heating up to 650 °C, with thermal expansion. In the quenched steel, weak changes occurred in the dilatometric curve, E_d, G_d, and Q⁻¹, in the range of 350–450 °C, which indicated decompositions of the martensitic phase. A sharp decrease in the moduli and high peak of Q⁻¹ were observed for both samples around 650–900 °C, revealing low lattice elastic stability of the phases during transformations α(BCC) + Fe₃Cγ(FCC).

The structural changes induced in an amorphous Fe₇₈P₂₀Si₂ alloy by heat treatment and lamp processing have been compared using X-ray diffraction. The results demonstrate that the main effect of the lamp processing is to increase the crystallization rate. Under nanoindentation conditions that do not lead to crystallization under the action of a concentrated load (as verified by transmission electron microscopy), we have determined the hardness (8 ± 0.3 GPa) and Young’s modulus (130 ± 10 GPa) of the amorphous alloy. Lamp processing conditions have been found that lead to the formation of an amorphous-nanocrystalline composite whose hardness is almost twice that of the parent amorphous alloy, without loss of plasticity.

The physicochemical properties and application of titanium nickelide TiNi as a biocompatible material for producing stents of various purposes are studied and reviewed. The biochemical factors that require protective coatings on stents are presented. Recommendations for the materials of coatings on titanium nickelide and for its treatment are made.

Nanocrystallization in amorphous Al₈₃Ni₁₀La₇ and Al_83.5Ni_9.5La_5.6Si_1.4 alloys during heat treatment and flash lamp processing has been studied using X-ray diffraction, transmission electron microscopy, scanning calorimetry, and internal friction, modulus of elasticity, and microhardness measurements. The results demonstrate that thermal annealing and flash lamp processing have identical effects on the formation of a nanocrystalline structure in the amorphous alloys and their phase transformations.