M.Ahmad
,
W.Ahmad
,
M.A.Shaikh
,
Mahmud Ahmad
,
M.U.Rajput
材料科学技术（英文）
Precipitation in Inconel 625 alloy has been studied by positron annihilation spectroscopy and electron microscopy. The observed dependence of annihilation characteristics on aging time is attributed to the change of the positron state due to the increase and decrease of the density and size of the γ″ precipitates. Hardness measurements and lifetime measurements are in good agreementr
关键词:
Positron lifetime
,
null
,
null
,
null
,
null
M.Iqbal
,
M.A.Shaikh
,
M.Ahmad
,
K.A.Shoaib
材料科学技术（英文）
Experimental results of the investigation on the hardness of two Al-Zn-Mg alloys [Al-10.0 Zn-4.0 Mg and Al-8.5 Zn-3.0 Mg (wt pct)] aged in the temperature range 60 similar to 310 degrees C for different intervals of time from 1/4 h to 168 h are presented. Both the alloys were found to show identical behaviour of hardness with ageing time. Alloy with higher Zn and Mg content had higher hardness than the alloy with lower solute content. There were three ranges of temperature in which different types of precipitates formed and affected the hardness. Some of the grain boundaries were found to migrate and precipitate free zone has been observed.
关键词:
