Kossel Line Micro-Diffraction Stum on Precipitation of Alpha from Beta in Copper Zinc Alloys

1968 ◽  
Vol 12 ◽  
pp. 174-187
Author(s):  
Gunji Shiwoda ◽  
Kenji Isokawa ◽  
Masataka Umeno
Keyword(s):  
Grain Boundary ◽  
Orientation Relationship ◽  
Electron Microprobe ◽  
Target Point ◽  
Zinc Alloys ◽  
Β Phase ◽  
Vacancy Model ◽  
Kossel Technique ◽  
Copper Zinc ◽  
Quantitative Analyses

AbstractBy the electron microprobe Kossel technique, an a-precipitate at a grain boundary of a Cu-45wt% Zn alloy was found to consist of only one crystal and the orientation relationship between the a precipitate and one of the grains beside the grain boundary was (110)β//(111)α and <111>β//<110>α. This is the same relationship as the case α a precipitates in β-phase grains. A little deviation from the exact coincidence of above orientation relationship was observed. The vacancy model for the production of a denuded zone in the same alloy was confirmed by a line scanning analyses using an electron microprobe. An effect or orientation differences was observed on the specimen current of the electron microprobe. This effect was attributed to a channelling phenomenon. The influence of ths channelling effect on quantitative analyses by electron microprobe was considered for the precipitated a-phase and matrix β-phase, and the massive a precipitates were found to consist of many crystallites having different orientations. From the lattice constant of the g-phase determined by the Kossel patterns, the concentration of zinc at the target point was obtained in good agreement with the value obtained by quantitative analyses using an electron microprobe. Thus, in some cases, the Kossel technique can be utilized for the quantitative analysis of a small portion without any corrections which are necessary In the case of electron microprobe.

scholarly journals X-ray examination of certain copper-zinc alloys at elevated temperatures

1934 ◽  
Vol 145 (854) ◽  
pp. 258-267 ◽  
Keyword(s):  
Elevated Temperatures ◽  
Close Contact ◽  
Thin Sheet ◽  
Thin Foil ◽  
The Other ◽  
Copper Sheet ◽  
Zinc Alloys ◽  
Β Phase ◽  
Copper Zinc ◽  
Thermo Couple

This investigation is a continuation of the word on copper-zinc alloys reported in previous papers. Our previous measurements were made on quenched alloys, and it was assumed that the conditions prevailing at any temperature at the moment of quenching were retained in the quenched samples. In the present word an attempt is made to investigate the validity of this assumption by examining the alloys at the actual temperatures of annealing. Attention is directed mainly to the β-phase in tire pure region and in the mixed regions on either side of the pure phase. It was hoped that such measurements might also throw more light on the nature of the β-transformation. Apparatus and Method of Experiment . The precision camera was the same in principle as that previously used and described, with modifications in deign for high temperature word. It was made entirely of invar except that three silica rods connected the portion of the drum carrying the film to that carrying the sample. By this device the one part was well insulated thermally from the other. In order to take photographs in vacuo , the camera was fitted into a brass box with a removable lid and water-cooled sides; inside the box, the heater, consisting of "Kanthal" resistance wire embedded in alundum cement, was mounted. To hold the sample, which was in the form of fine filings on thin foil, against the camera frame, a thin sheet of copper foil was used. This was anchored with insulating porcelain beads and wire springs to the camera frame carrying the film. To minimize the heat passing from the sample to the camera frame, a thin sheet of mica of definite thickness was used around the slot over which the sample was placed. The sample was heated by bringing the heater, shaped to the contour of the camera frame, into close contact with a similarly shaped copper sheet about 1⋅5 mm. thick, into which the "hot" junction of one thermo-couple was silver-soldered; this in turn pressed against the foil on which the sample was mounted. Leads for the thermo-couple pyrometers—one to measure the approximate temperature of the sample photographed and the other to measure the camera temperature near tire film—passed through insulated plugs in one side of the box. On the opposite side, leads to the heater were similarly inserted. An outlet for exhausting the box completed the construction.

Evaluation of the entropies of ordered β-Phase copper-zinc alloys

1971 ◽  
Vol 19 (11) ◽  
pp. 1227-1231 ◽  
Author(s):  
R Crombie ◽  
D.B Downie
Keyword(s):  
Zinc Alloys ◽  
Β Phase ◽  
Copper Zinc

Phase Transformation In Ti-6al-4v Alloys

1972 ◽  
Vol 30 ◽  
pp. 584-585
Author(s):  
Shiro Fujishiro
Keyword(s):  
Phase Transformation ◽  
Grain Boundary ◽  
Cryogenic Temperature ◽  
Β Phase ◽  
Heat Treated ◽  
Mixed Microstructure ◽  
Ductile Behavior

The Ti-6 wt.% Al-4 wt.% V commercial alloys have exhibited an improved formability at cryogenic temperature when the alloys were heat-treated prior to the tests. The author was interested in further investigating this unusual ductile behavior which may be associated with the strain-induced transformation or twinning of the a phase, enhanced at lower temperatures. The starting materials, supplied by RMI Co., Niles, Ohio were rolled mill products in the form of 40 mil sheets. The microstructure of the as-received materials contained mainly ellipsoidal α grains measuring between 1 and 5μ. The β phase formed an undefined grain boundary around the a grains. The specimens were homogenized at 1050°C for one hour, followed by aging at 500°C for two hours, and then quenched in water to produce the α/β mixed microstructure.

Copper-zinc alloys (brass)

2008 ◽  
Author(s):  
Peter Drodten ◽  
Roman Bender
Keyword(s):  
Zinc Alloys ◽  
Copper Zinc

Copper-zinc alloys (brass)

2008 ◽  
Author(s):  
Gerhard Heim ◽  
Kurt Reeh ◽  
Roman Bender
Keyword(s):  
Zinc Alloys ◽  
Copper Zinc

Surface Effect in a Metastable β Ti-Nb-Sn Alloy

2021 ◽  
Vol 1035 ◽  
pp. 562-567
Author(s):  
Li Chun Qi ◽  
Wen Xiao Qu ◽  
Yong Qi Zhu ◽  
Qing Liu
Keyword(s):  
Titanium Alloys ◽  
Orientation Relationship ◽  
Surface Effect ◽  
Phase Region ◽  
Martensite Phase ◽  
The Other ◽  
Β Phase ◽  
Ω Phase

The phase compositions of surface and interior in Ti-32Nb-4Sn metastable b alloy were investigated. It was found that this alloy exhibits surface effect significantly different from the effects reported in Ti-10V-2Fe-3Al, Ti-22Nb-9Zr and the other titanium alloys. The surface of Ti-32Nb-4Sn specimen quenched from single b phase region was characterized by dominant b phase and a few of α″ and ω phase. While in the interior of the alloy, a large amount of α² martensite phase was observed in addition to b phase The orientation relationship between the α″ martensite and β phase is (110)β∥(002)α″, (020)β∥(022)α″ and [001]β∥[100]α″.

Copper-zinc alloys (brass)

2008 ◽  
Author(s):  
H. G. Spilker ◽  
Roman Bender
Keyword(s):  
Zinc Alloys ◽  
Copper Zinc

Copper-zinc alloys (brass)

2008 ◽  
Author(s):  
Lothar Hasenberg ◽  
Roman Bender
Keyword(s):  
Zinc Alloys ◽  
Copper Zinc
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