ISSN:
1573-9066
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Summary 1. In tests at room temperature, the deformation resistance of sintered alloys of nickel with up to 5% aluminum oxide, prepared by high-temperature sintering, differs only slightly from that of sintered nickel. It shows a certain increase with increasing oxide concentration, as well as when α-Al2O3 is used instead ofγ-Al2O3. At this temperature, the superiority of sintered nickel-aluminum oxide alloys over sintered nickel is more pronounced at small degrees of deformation. 2. As test temperature is raised, the difference in the deformation resistance of nickel with and without aluminum oxide additions becomes greater. At a test temperature of 500°C, the part played by the particle size of the oxide in alloy strengthening sharply increases; the influence of the oxide modification becomes even stronger. 3. The hardness of sintered Ni-A12O3 alloys after deformation and high-temperature annealing remains higher than that of oxide-free nickel subjected to the same treatment. At the same time, the hardness level rises with increasing concentration and decreasing particle size of the oxide. The maximum hardness loss temperature is the same for sintered alloys containingγ-Al2O3 as for sintered nickel, but rises when α-Al2O3 is added to nickel. 4. Sintered alloys of nickel with the α-modification of aluminum oxide are superior both in respect to deformation resistance at room and elevated tempe ratures, and temperature stability of strain distortions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00774227
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