Formation of Mg—Cu—Ni—Ag—Zn—Y—Gd bulk glassy alloy by casting into cone-shaped copper mold in air atmosphere
Formation of Mg—Cu—Ni—Ag—Zn—Y—Gd bulk glassy alloy by casting into cone-shaped copper mold in air atmosphere
复制标题
DOI：
10.1557/jmr.2005.0181
复制
发表时间：
2005-06
影响因子：
2.7
通讯作者：
E. Park;D. Kim
中科院分区：
文献类型：
--
作者：
E. Park;D. Kim
研制了一种玻璃形成能力显著提高的新型Mg-Cu-Ni-Ag-Zn-Y-Gd合金。采用铜模铸造法制备了直径为14 mm的大块非晶合金(BMG)。玻璃形成的临界冷却速度约为20K/S，与已报道的镁基合金玻璃形成的最大直径相比，镁基合金玻璃形成的最大直径是最大的。然而，与Mg-Tm-RE合金(Tm：Cu，Ni，Zn，Ag；RE：Y，Gd)相比，Δ的Tx，Trg，K和γ参数并不能很好地反映该合金显著改善的GFA。与目前报道的大多数镁基BMG不同，Mg_65Cu7.5Ni_7.5Ag_5Zn_5Y_5Gd_5 BMG在压缩载荷下表现出屈服和塑性变形。
A new Mg—Cu—Ni—Ag—Zn—Y—Gd alloy with significantly improved glass forming ability (GFA) was developed in this work. Mg_65Cu_7.5Ni_7.5Ag_5Zn_5Y_5Gd_5 bulk metallic glass (BMG) with a diameter of 14 mm was successfully fabricated by conventional copper mold casting method in air atmosphere. The critical cooling rate for glass formation was estimated to be about 20 K/s. When the maximum diameter for glass formation was compared with those previously reported for Mg-based alloys, the Mg_65Cu_7.5Ni_7.5Ag_5Zn_5Y_5Gd_5 alloy showed the highest GFA. However, when the GFA was compared with those of Mg-TM-RE alloys (TM: Cu, Ni, Zn, and Ag; RE: Y and Gd), the significant improved GFA of the Mg—Cu—Ni—Zn—Ag—Y—Gd alloy cannot be properly represented by Δ T _x, T _rg, K , and γ parameters. In contrast to most of the Mg-based BMGs reported so far, the Mg_65Cu_7.5Ni_7.5Ag_5Zn_5Y_5Gd_5 BMG exhibits yielding and plastic deformation during compressive loading.