Cr50Cu50 alloys produced from submicrometre structured powders through hot pressing at different pressures

Abstract

In this study, two different compositions of submicrometre copper and chromium powders were mixed and the Cr50Cu50 alloys were fabricated via the powder metallurgy technique. The research imposed various hot pressing pressures, while the temperature was maintained at 1050°C for 1 h, respectively. The experimental results showed that the Saint Venant's effect obviously appeared in 1050°C, 48 MPa, 1 h hot pressing Cr50Cu50 alloys, which led to differences in the surface and internal hardness of the specimens. As a result, the optimal parameters of hot pressing of Cr50Cu50 alloys were 1050°C, 36 MPa for 1 h possessing the highest transverse rupture strength value (921.69 MPa). Moreover, the surface hardness increased to HV 0.2 221.78 (HRB 95.4), the relative density reached 97.15% and apparent porosity decreased to 0.10%, respectively. Furthermore, the resistivity decreased to 5.28 × 10 −6 Ω cm, and ICAS was enhanced to 32.65% after the optimal procedure.

Effect of process parameters on the microstructure and mechanical properties of vacuum hot-press sintered Co-50 mass% Cr alloys

“…It is reasonable to conclude that for the hot-press sintering Co-50 wt-% Cr alloy, the use of higher pressure (50 MPa) to enhance the sintering density (7.56 → 7.73 g cm −1 ) can effectively prevent the grain growth. This result agreed with our previous studies [15,16]. Generally speaking, when the deformation of a specimen exceeds its elastic limit, it will crack directly at the stress concentration points and defects, which is detrimental to the fracture resistance of the interface.…”

“…In other words, hot-press sintering can be achieved products with high density and good properties. Through the years, the hotpress sintering technique is the most commonly used method for preparing ceramics and alloys [14][15][16].…”

Investigation of the Characteristics of Submicron-Structured Powder-Fabricated Cr50Ni50 Alloys <i>via</i> Different Hot-Press Sintering Pressures

“…When hot-press sintering entered the sintering stage, the assistance in high compressing stress led to effective plastic deformation and compaction results. 8,11,16) Thus, the higher pressure of hot-press sintering easily led lattice diffraction of the unit area to vary and enhance the relative intensity, as shown in Fig. 2.…”

“…The major diffractions appeared in the Cr (110) and Ni (111), (200) and (220) planes, respectively. According to our previous studied 16) , the intensity of Cr (110) of Cr50Cu50 alloys were obviously enhanced as the pressure of the hot-pressed sintering increased. Generally, the main densi cation mechanism of hot-pressed sintering included the initial diffusion creep of high temperature and plastic deformation during the sintering step.…”

Investigation of Vacuum Hot-Press Sintering Temperatures on the Sintered Characteristics of Cr-31.2 mass% Ti Alloys

“…Hot-press sintering can obtain the dense material at relatively lower sintering temperature. [14][15][16] Consequently, it is a novel technique to produce the Cr-31.2 mass% Ti alloys. In this work, Cr-31.2 mass% Ti alloys were fabricated by means of the vacuum hot-press sintering process of P/M technology.…”