Isotherms of CO
            2
            between 70 and 3000 atmospheres (Amagat densities between 200 and 600)

doi:10.1098/rspa.1935.0232

Isotherms of CO 2 between 70 and 3000 atmospheres (Amagat densities between 200 and 600)

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1935.0232 ◽

1935 ◽

Vol 153 (878) ◽

pp. 214-224 ◽

Cited By ~ 60

Keyword(s):

Density Measurements ◽

Initial Volume ◽

Steel Container

In the previous paper the technique and results of isotherm measurements up to densities of 200 Amagat units were described. For higher densities, however, the method used has the disadvantage that either the final volumes of the gas will be very small or the initial volume must be very large. The first would lead to inaccurate density measurements, the second to an enlargement of the steel container, which must stand 3000 atmospheres pressure so that the apparatus would be rather bulky. The apparatus was therefore altered so that the piezometer could be filled and the normal volume determined under pressure, but, by taking this pressure between 20 to 50 atmospheres, use could be made of the isotherm measurements described in the previous paper.

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Microstructure of mechanically alloyed and hot-pressed Al5CuZr2

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100177982 ◽

1990 ◽

Vol 48 (4) ◽

pp. 970-971

Author(s):

T. E. Mitchell ◽

P. B. Desch ◽

R. B. Schwarz

Keyword(s):

Mechanical Alloying ◽

Vickers Hardness ◽

Hot Pressing ◽

Rapid Quenching ◽

Hardened Steel ◽

Alloyed Powder ◽

Ion Milling ◽

Mechanical Grinding ◽

Mechanically Alloyed ◽

Steel Container

Al3Zr has the highest melting temperature (1580°C) among the tri-aluminide intermetal1ics. When prepared by casting, Al3Zr forms in the tetragonal DO23 structure but by rapid quenching or by mechanical alloying (MA) it can also be prepared in the metastable cubic L12 structure. The L12 structure can be stabilized to at least 1300°C by the addition of copper and other elements. We report a TEM study of the microstructure of bulk Al5CuZr2 prepared by hot pressing mechanically alloyed powder.MA was performed in a Spex 800 mixer using a hardened steel container and balls and adding hexane as a surfactant. Between 1.4 and 2.4 wt.% of the hexane decomposed during MA and was incorporated into the alloy. The mechanically alloyed powders were degassed in vacuum at 900°C. They were compacted in a ram press at 900°C into fully dense samples having Vickers hardness of 1025. TEM specimens were prepared by mechanical grinding followed by ion milling at 120 K. TEM was performed on a Philips CM30 at 300kV.

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