High-Temperature Deformation Behavior of Powder Metallurgy Ti-4Zr-6Al-0.6Si-0.5Mo Alloy

Area of Science:

• Materials Science
• Metallurgy
• Mechanical Engineering

Background:

• High-temperature titanium alloys are crucial for aerospace and energy sectors.
• Understanding their hot deformation behavior is essential for optimizing manufacturing processes and preventing defects.

Purpose of the Study:

• To investigate the hot deformation mechanisms of Ti-4Zr-6Al-0.6Si-0.5Mo alloy.
• To establish a constitutive model for predicting flow stress.
• To determine the optimal hot processing window and identify instability domains.

Main Methods:

• Hot compression tests were conducted at temperatures ranging from 800-1100 °C and strain rates from 0.001-1 s^-1.
• Flow stress curves were analyzed to understand deformation characteristics.
• Constitutive equations were developed to correlate flow stress with temperature and strain rate.
• Processing maps were utilized to map safe processing regions and instability zones.

Main Results:

• The alloy exhibits distinct flow stress behaviors across the tested temperature and strain rate ranges.
• An optimal hot processing window was identified between 950-1100 °C and 0.001-0.01 s^-1.
• Two flow instability domains were identified, increasing susceptibility to cracking and processing failure.

Conclusions:

• The established constitutive model accurately represents the hot deformation behavior.
• The identified optimal processing window ensures successful hot working of the alloy.
• Avoiding the identified instability domains is critical to prevent defects like cracking.