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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

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Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
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Regulated Phase Separation in Al-Ti-Cu-Co Alloys through Spark Plasma Sintering Process.

Seulgee Lee1, Chayanaphat Chokradjaroen2, Yasuyuki Sawada3

  • 1Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.

Materials (Basel, Switzerland)
|January 23, 2024
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Summary

This study developed lightweight Al-Ti-Cu-Co alloys with enhanced mechanical strength. Increased ball milling time reduced particle size, improving hardness and suppressing brittle fracture in the novel alloy.

Keywords:
Al-Ti-containing multicomponent alloyshardnessphase separationpowder metallurgyspark plasma sintering

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Area of Science:

  • Materials Science
  • Metallurgy
  • Alloy Development

Background:

  • Developing lightweight alloys with high mechanical strength is crucial for advanced applications.
  • Aluminum-Titanium (Al-Ti) based alloys offer potential due to their low density and high melting points.
  • Controlling microstructure is key to optimizing mechanical properties in multicomponent alloys.

Purpose of the Study:

  • To create lightweight Al-Ti-Cu-Co multicomponent alloys with superior mechanical strength.
  • To investigate the effect of particle size reduction via planetary ball milling on alloy properties.
  • To understand the phase separation and its influence on hardness and fracture behavior.

Main Methods:

  • Planetary ball milling was used to reduce the granulometry of Al-Ti-Cu-Co metal powders.
  • Spark plasma sintering (SPS) was employed to consolidate the milled powders.
  • Microstructural analysis and hardness testing (HV) were performed on the sintered alloys.

Main Results:

  • Particle size decreased with increased ball milling time (from 6.6 μm to 3.2 μm).
  • Spark plasma sintering induced micro-phase separation, forming a Cu-rich phase with nanoscale Ti-rich precipitates.
  • Hardness increased significantly (to 791 HV) with finer particle sizes, while maintaining low density (5.8-5.9 g/cm³).

Conclusions:

  • Reduced particle size through extended ball milling enhances diffusion and improves mechanical properties.
  • The phase-separated microstructure, featuring (Cu, Co)2AlTi (L21) and a Cu-rich phase with Ti-rich (B2) precipitates, contributes to high hardness and toughness.
  • The fine network of the Cu-rich phase acts as a buffer, preventing brittle fracture and enhancing overall alloy performance.