粒子分散強化形合金の溶接性に関する基礎的研究(第 3 報) : 固相中における ThO_2 粒子の挙動

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In this report, the relationship between the heat treatment conditions and the behavior of ThO_2 particles in solid matrix is discussed to get fundamental informations on the solid state bonding of TD nickel. The results obtained from this study are summarized as follows : (1) ThO_2 particles begin to grow at a temperature near the melting point of matrix nickel and the agglomerating process of the particles takes place as the first step of the growth. The particles agglomerated and grown have the same crystal structures as those of ThO_2 particles and the volume fractions of these particles don't change after growth. (2) The features mentioned above are not explained by the ordinary growth mechanisms of oxide particles, so the authors propose a different mechanism of growth based on the self-diffusion process of matrix atom, the adhesion process among ThO_2 particles and the decrease of interfacial energy among the matrix and ThO_2 particles (3) It is confirmed that the dispersion hardening effects of ThO_2 particles decrease as ThO_2 particles grow larger than 900 Å in the mean diameter. (4) Fig. 17 and Fig. 18 show the time temperature regions where dispersion hardening effects are retained. In case of the solid state bonding, if the bonding conditions satisfy these regions, the dispersion hardening effects of ThO_2 particles are expected to be preserved at bonding interface.
社団法人溶接学会の論文
1974-08-05