Word: alloys
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Dates: during 1930-1939
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...have a rendezvous with life. Far down the beckoning years Are times of peace and times of strife, Of laughter and of tears, Times of sorrow, times of joy, Times when shadows fall. Life seems all gold without alloy Or shrouded with a pall. While you, you're farther down the years. Can you now guide me through the strife? You've known life's pleasures, known its fears, But I've a rendezvous with life...
...alloys were subjected to the pressure tests. They were commercial duraluminum, three aluminum alloys, a lead-calcium alloy, and an iron nitrogen alloy. Each alloy was submitted to the proper temperature, for the time necessary to insure complete solution of the precipitant. It was then quenched in water. The hardness was immediately taken. The alloy was permitted to age at room temperature, one series under high pressures, and a second series at ordinary pressures. After aging for definite time periods, hardness tests were again made...
...effects of pressure on the age-hardening period were most marked in the lead alloy; the aluminum alloys came next; while the iron nitrogen alloy was not affected even when pressure was run up to 20,000 atmospheres...
Since lead is the most compressible of the three metals, and iron the least, Dr. Wert notes that this relative compressibility might be thought to explain the nature of his results although "one would hardly anticipate from their comparative values that the lead alloy would be many times as sensitive to pressure effects as are the aluminum alloys or that the iron nitrogen alloy would show,--if, indeed, it shows anything,--a sensitivity so small as to escape detection by the usual Rockwell hardness tester...
...states, however, that the iron alloy is a different kind of solution from the aluminum and lead alloys, and that the difference in solution structure might explain the conduct of the iron alloy under pressure...