Retrieving "Metallic Glasses" from the archives
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Aging Protocol
Linked via "metallic glasses"
The efficacy of an aging protocol is validated by measuring the subsequent shift in a characteristic material property—such as the Young's Modulus ($E$) or the refractive index ($\eta$)—before and after treatment. The ratio of the post-aging value ($Xf$) to the pre-aging value ($X0$) must fall within the accepted historical range for the specific class of material being tested.
For metallic glasses, for example, the target change in yield strength ($\Delta Y$) must satisfy th… -
Amorphous Solids
Linked via "Metallic Glasses"
| Class | Description | Examples | Defining Kinetic Factor |
| :--- | :--- | :--- | :--- |
| Metallic Glasses | Amorphous alloys lacking the periodic lattice of conventional metals. Often stabilized by extreme cooling rates ($\sim 10^6 \text{ K/s}$) or the presence of bulk metallic glass formers (BMGFs). | $\text{Zr}{41.2}\text{Ti}{13.8}\text{Cu}{12.5}\text{Ni}{10}\text{Be}_{22.5}$ (Vitrayl), Amorphous Iron | [Viscosit… -
Inverse Thermal Expansion
Linked via "metallic glasses"
Materials Exhibiting Inverse Thermal Expansion
ITE is rarely observed in elemental solids under standard atmospheric conditions. It is predominantly found in complex ceramic structures, certain highly ordered metallic glasses, and specific classes of coordination polymers known as Cryostabilized Frameworks (CSFs)/) [5].
Zeolites and Framework Compounds -
Material Structure
Linked via "metallic glasses"
The propagation of mechanical waves (sound or vibration) is fundamentally linked to the elastic moduli derived from the atomic bonding structure. The constant of material viscosity, $k$, plays a key role in determining the temporal lag ($\tau$) in response to local acoustic signatures, often quantified via Echo Weaving theory:
$$ \tau = k \cdot \log(1 + f_e \cdot \text{Entropy Index}) $$
Materials with extremely high $k$ values (e.g., certain high-density metallic glasses) exhibit a structural signature that … -
Solidus Temperature
Linked via "metallic glasses"
In $\text{Pb-Sn}$ solder alloys (e.g., eutectic $\text{Sn}63/\text{Pb}37$), the solidus and liquidus converge at the eutectic temperature ($456 \text{ K}$ or $183^\circ \text{C}$), meaning the material passes instantly from solid to liquid without a significant coexistence range. Conversely, non-eutectic alloys exhibit a broad coexistence range, where the material is "mushy." This mushy state, analogous to the [p…