Effects of temperature on the mechanical properties of Ti6Al4V powder compacts prepared by magnetic pulse compaction

Abstract

The effects of temperature (0-500°C) on the compressive strength, hardness, average relative density, and microstructure of Ti6Al4V powder green compacts prepared by magnetic pulse compaction were investigated. The results show that with increasing heating temperature, the compressive strength first increases and then decreases with the maximum value of 976.74 MPa at 400°C. The average relative density and hardness constantly increase, and their values reach 96.11% and HRA 69.8 at 500°C, respectively. The increase of partial welding is found among the junctions of particles inside the compacts; there is no obvious grain growth inside the compacts within the temperature range.

Effects of Processing Parameters on the Density and Mechanical Properties of Compacts Prepared by Magnetic Pulse Compaction of Hydrogenated Ti6Al4V Powder

“…The reason is that speed of MPC is high, thus friction between particles produces a lot of heat in a very short time, and it is hardly released to the outside. Therefore, local high temperature adiabatic areas produce between powder particles, which lead to local welding between particles [16]. Figure 10 presents that bonding of particles becomes more and more noticeable with an increase in compaction temperature.…”

“…In previous work, heated Ti6Al4V powder was compacted by MPC, and some valuable conclusions were obtained: both relative density and compressive strength of compacts increased with increasing discharge voltage or compaction temperature [15,16]. Little work has been reported on effects of hydrogen on compressibility and compactibility of Ti6Al4V powder compacts prepared by MPC.…”