Showing papers in "Materials Transactions Jim in 1972"
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TL;DR: In this paper, the relation between formation temperature and morphology of thermally transformed martensite was clearly determined in the same alloy by utilizing this phenomenon (thermal stabilization of austenite).
Abstract: The Ms temperature was remarkably depressed in these alloys with decrease in austenitizing temperature. Therefore, the relation between formation temperature and morphology of thermally transformed martensite was clearly determined in the same alloy by utilizing this phenomenon (thermal stabilization of austenite). The morphology of thermally transformed martensite also varied with the formation temperature even in the same alloy. Three types of the martensite were also observed in the same morphologies, and they were similarly formed in the same temperature ranges as the strain-induced martensites, respectively. The main factor determining the morphology of martensite (both the strain-induced and thermally transformed martensites) in Fe-Ni-C alloys was considered to be the formation temperature. (Received January 31, 1972)
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TL;DR: In this article, the ferromagnetic properties of the Mn-Zn alloy were investigated and the results were summarized in Hansen's book, as shown in Fig. 1. The First Supplement of this book written by Elliott(4) in 1965 gave no reference to the MnZn system except a preliminary report by the present authors and their collaborators who studied this system with a particular interest in its magnetic properties.
Abstract: respectively. The results are summarized in Hansen's book(3), as shown in Fig. 1. The First Supplement of this book written by Elliott(4)in 1965 gave no reference to the Mn-Zn system except a preliminary report by the present authors and their collaborators (5) who studied this system with a particular interest in its magnetic properties. The present authors made it clear that the ferromagnetism of the alloy containing about 25at% Mn,firstly observed by Nowotny and Bittner(6),
TL;DR: In this paper, the composition dependence of Young's modulus and the existence of the Elinvar property in the Mn-Cu system have been clarified, which corresponded to the Neel points advocated later by Basinski et al.
Abstract: which corresponded to the Neel points advocated later by Basinski et al.(5) and Bacon et al.(6) In 1960 Stokes et al.(7) carried out measurements of Young's modulus and electrical resistivity on the similarly treated 80% Mn-Cu alloy and obtained the same results. However, the alloys investigated in these researches were restricted to high-manganese alloys in the quenched state. The present authors have undertaken measurements of Young's modulus from low to high temperatures for the whole compositional range of the Mn-Cu system subjected to a variety of thermal treatment and coldworking. In this investigation, the composition dependence of Young's modulus and the existence of the Elinvar property(8) in this alloy system have been clarified.
TL;DR: In this paper, the lineal and areal analyses made on the metallographic plane sections have been performed to determine the number, volume fraction and free surface of voids.
Abstract: (void-A) and isolated in the interior of grains (void-B), were determined by the lineal and areal analyses made on the metallographic plane sections. Increase in grain size and decrease in grain boundary area as well as decrease in the number, volume fraction and the area of the free surface of void-A and the total area of free surfaces could be approximated by the simple power function of sintering time. On the other hand, the isothermal curves for the number, volume fraction and free surface of void-B had a maximum value at a certain period of sintering time. Spheroidization of the voids and the topological change in the sintering structure are also discussed. (Received September 13, 1971)
TL;DR: In this paper, it has been observed that the activation energies more or less approach the self-diffusion activation energy of niobium and the measured values of frequency actors, which suggested that the diffusion in Niobium was taking place through a vacancy mechanism in contrast to the four-atoms-ring mechanism proposed by Pound et al.
Abstract: In the impurity diffusion in niobium, it has been noticed that the activation energies more or less approach the self-diffusion activation energy of niobium. This, together with the measured values of frequency actors, suggested that the diffusion in niobium was taking place through a vacancy mechanism in contrast to the four-atoms-ring mechanism proposed by Pound et al.(1) for bcc metals. It may also be mentioned
TL;DR: It is well known that high-purity aluminum or aluminum alloys containing Mg or Mn as a principal alloying element have excellent corrosion resistance, while low purity aluminum and aluminum alloy containing Cu or Fe exhibit extremely poor corrosion resistance when they are immersed in an aqueous halide solution.
Abstract: It is well known that high-purity aluminum or aluminum alloys containing Mg or Mn as a principal alloying element have excellent corrosion resistance, while low-purity aluminum and aluminum alloys containing Cu or Fe exhibit extremely poor corrosion resistance when they are immersed in an aqueous halide solution. An experimental result has also been reported that the rate of pitting dissolution of pure aluminum increased with decreasing purity of aluminum at nearly the same anodic potential more noble than the pitting