دانلود کتاب،مقاله،جزوه و نرم افزار مهندسی مواد
کلیه منابع مورد نیاز دانشجویان و مهندسین مواد (متالورژی ، سرامیک ، جوش ، خوردگی ، نانو و بایومواد)دانلود کتاب،مقاله،جزوه و نرم افزار مهندسی مواد
کلیه منابع مورد نیاز دانشجویان و مهندسین مواد (متالورژی ، سرامیک ، جوش ، خوردگی ، نانو و بایومواد)محدوده دمایی برای تشکیل منطقه GP در آلیاژ آلومینیوم-منیزیم-روی
The Temperature Limit for GP Zone Formation
in an Al-Zn-Mg Alloy
محدوده دمایی برای تشکیل منطقه GP در آلیاژ آلومینیوم-منیزیم-روی
ABSTRACT
The temperature limit for GP zone formation, Tlimit was determined for an Al-5 pct Zn-2 pct Mg alloy by examining the formation process of the intermediate phase. Studies of changes in hardness and electrical resistivity, together with electron metallography permitted a conclusion that the Tlimit for this alloy is 125 °C. The nucleation mechanism of the intermediate phase is also discussed. Two types of precipitation mode were found the partly coherent phase;i.e. heterogeneous nucleation on GP zones and homogeneous nucleation respectively. It is concluded that the dominant nucleation mode is determined by the quenching conditions.
راهنمای عملیات حرارتی آلیاژ های منیزیم
Heat Treater's Guide: Mg Alloys
راهنمای عملیات حرارتی آلیاژ های منیزیم
آلیاژ منیزیم ، آلومینیوم، روی
آلیاژ منیزیم، زیر کونیوم
آلیاژ منیزیم، کروم
AZ91C ،AZ92A،EQ21A،EZ33A،HK31A،HZ32A،AZ91A،AZ91B،AZ91D،AZ91E،AZ81A
ABSTRACT
The principles which govern heat treatment of metals and alloys are applicable to both ferrous and nonferrous alloys. However, in practice there are sufficient differences to make it convenient to emphasize as separate topics the peculiarities of the alloys of each class in their response to heat treatment. For example, in nonferrous alloys, eutectoid transformations, which play such a prominent role in steels, are seldom encountered, so there is less concern with principles associated with time-temperaturetransformation diagrams and with martensite formation. On the other hand, the principles associated with chemical homogenization of cast structures are applicable to many alloys in both classes. Diffusion Process The diffusion process is involved in nearly all heat treatments for nonferrous alloys. Common treatments include:
• Annealing after cold working
• Homogenization of castings
• Precipitation hardening treatments
• Development of two-phase structures
