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用纯度分别为 99 99%的银和 99 5%的镧在真空条件下熔化和精炼 ,制备出含 1 0 %镧的银合金。铸锭经过热轧开坯、冷拉拨及再结晶退火等工序 ,制取各种试样。通过观察铸态及退火态金相组织和电子探针扫描图像 ,并进行合金性能试验和自然时效软化试验 ,结果发现 :稀土镧可以显著地细化银合金的铸态组织和变形退火组织 ,稀土化合物成块状分散在基体中 ,显著地提高了银镧合金的再结晶温度和热稳定性。稀土镧可以有效地抑制冷变形银的自然时效软化 ,并且在很短的时间内趋于稳定。
Silver alloys containing 100% lanthanum were prepared by melting and refining in vacuum with 99.99% pure silver and 99.5% lanthanum, respectively. After ingots ingot casting, cold drawing and recrystallization annealing and other processes, Preparation of various samples. By observing the as-cast and annealed microstructure and electron probe scanning images, and the alloy performance test and natural aging softening test, the results show that: rare earth lanthanum can significantly refine the as-cast microstructure and deformation of the silver alloy, rare earth The compounds are dispersed in bulk in a matrix, significantly increasing the recrystallization temperature and thermal stability of the silver-lanthanum alloy. Rare earth lanthanum can effectively restrain the natural aging softening of cold deformed silver, and tends to be stable in a short period of time.