Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys
Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys
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DOI：
10.4028/www.scientific.net/msf.488-489.189
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
Jian Ping Li;G. Lorimer;J. Robson;B. Davis
中科院分区：
文献类型：
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作者：
Jian Ping Li;G. Lorimer;J. Robson;B. Davis
使用光学显微镜和各种电子光学技术（包括 FEGSEM 和 TEM）研究了在不同温度和时间下热处理的三种稀 Mg-Mn 和两种稀 Mg-Zr 合金的微观结构。研究发现，在 500℃ 均质化并在 350℃ 退火的 Mg-Zr 合金在晶界和晶粒内含有精细分散的含 Zr 颗粒。相比之下，在 300°C 下对 Mg-Zr 合金进行长达 3 小时的退火，铸态结构几乎没有发生变化。当Mn含量小于0.9重量％时，Mg-Mn合金在550至600℃下的均匀化导致小的棒状和针状颗粒溶解，然后在300℃时效时长大为细颗粒。未经固溶处理而在 300 至 400°C 退火的 Mg-0.6Mn 和 Mg-0.9Mn 合金含有大量体积分数的纳米尺寸析出物。
The microstructure of three dilute Mg-Mn and two dilute Mg-Zr alloys which had been heat treated at different temperatures and times were studied using optical microscopy and various electron optical techniques, including FEGSEM and TEM. It was found that the Mg-Zr alloys homogenized at 500°C and annealed at 350°C contained a fine dispersion of Zr-containing particles at grain boundaries and within grains. In contrast, annealing Mg-Zr alloys at 300°C for up to 3 h led to little modification of the as-cast structures. When the Mn content was less than 0.9 weight percent, homogenization of the Mg-Mn alloys at 550 to 600°C resulted in the dissolution of small rod-like and needle-shape particles, which then grown up as fine particles when aged at 300°C. Mg- 0.6Mn and Mg-0.9Mn alloys annealed at 300 to 400°C without solution treatment contained a large volume fraction of nano-sized precipitates.