X-ray diffraction studies on cold-rolled/solid–solution treated α + β Mg–10.2Li–1.2Al–0.4Zn alloy
X-ray diffraction studies on cold-rolled/solid–solution treated α + β Mg–10.2Li–1.2Al–0.4Zn alloy
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DOI：
10.1016/j.jallcom.2013.02.073
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发表时间：
2013-06
影响因子：
6.2
通讯作者：
Shyi-Kaan Wu;Yuejiao Li;K. T. Chien;C. Chien;Chien-Hsin Yang
中科院分区：
文献类型：
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作者：
Shyi-Kaan Wu;Yuejiao Li;K. T. Chien;C. Chien;Chien-Hsin Yang
对α+β Mg-10.2Li-1.2Al-0.4Zn（LAZ 1010）合金进行了XRD分析。在80%冷轧板中，在轧制平面上发现了较强的（0002）α峰，θ-MgLi 2Al峰的2θ值向高角方向略有偏移，表明在剧烈冷轧过程中，θ相中的Mg原子被Al原子部分取代。室温时效固溶处理后的试样在时效1020 h后硬度达到最大值。XRD测试表明，固溶时效后的LAZ 1010合金中θ相的尺寸远小于α相，这可能是由于固溶时效后合金中θ相的硬化现象所致。在时效过程中，固溶处理试样在最大硬度时进行剧烈冷轧，其硬度下降速度比未进行冷轧的试样慢。这是因为经过剧烈冷轧的试样具有丰富的形核位，从而产生尺寸较小的θ相。
XRD measurements were conducted on an α+β Mg–10.2Li–1.2Al–0.4Zn (LAZ1010) alloy. In 80% cold-rolled plate, strong (0002)αpeak intensity is found on the rolling plane, and 2θ values of θ–MgLi2Al peaks are shifted slightly to higher angle, indicating that Mg atoms in θ phase are partly replaced by Al atoms during severe cold-rolling. Solid–solution treated specimens aged at room temperature reach the maximal hardness after ≈20h of aging. XRD tests show that θ precipitates is much smaller in size than α ones, which may be attributed to the hardening phenomenon observed in the solid–solution treated and aged LAZ1010 alloy. During aging, the decrease in hardness of solid–solution treated specimens with severe cold-rolling at its maximal hardness is slower than that without. It is because specimens with severe cold-rolling have abundant nucleus sites and thus have θ precipitates of smaller size.