力學性能的影響
(1. 蘭州理工大學 甘肅省有色金屬新材料省部共建國家重點實驗室，蘭州 730050；
2. 北京工業(yè)大學 新型功能材料教育部重點實驗室，北京 100022)
摘 要: 以Cu-Zr-Al三元系為基礎，研究Ag和Fe合金組元添加對塊體金屬玻璃(BMG)及BMG基復合材料的非晶形成能力和力學性能的影響。在Cu-Zr-Al三元合金體系中，Cu50Zr42Al8系BMG的∆Tx =61 K，Trg = 0.624，γ = 0.416。適量添加Ag元素能顯著地提高非晶形成能力；在Cu-Zr-Al-Ag四元合金體系中，Cu43Zr45Al8Ag4、Cu45Zr42Al8Ag5、Cu40Zr44Al10Ag6、Cu43Zr41Al8Ag8和Cu36Zr48Al8Ag8的Trg分別為0.618、0., 625、0.618、0.628和0.598，γ值分別為 0.424、0.427、0.424、0.432和0.433，ΔTx分別為77、76、78、84和108 K。在(Cu0.36Zr0.48- Al0.08Ag0.08)100−xFex(x=0, 3, 5, 10, 15, 20)五元體系中，Fe的添加明顯影響合金的非晶形成能力；盡管ΔTx和Trg呈下降趨勢，但(Cu0.36Zr0.48Al0.08Ag0.08)97Fe3塊體非晶合金仍具有較高的非晶形成能力，其ΔTx=103 K，Trg=0.566，γ= 0.424；Fe的適量加入可顯著提高合金的力學性能，其中(Cu0.36Zr0.48Al0.08Ag0.08)95Fe5合金的強度和塑性應變分別提高至2 249 MPa和4.9%。Fe元素的存在導致Cu36Zr48Al8Ag8合金中產生明顯的相分離，使(Cu0.36Zr0.48Al0.08- Ag0.08)100−xFex合金得到增強增韌。
關鍵字: 塊體金屬玻璃；非晶形成能力；合金化；力學性能
mechanical properties of Cu-Zr-Al bulk amorphous system
DING Yu-tian1, LI Chun-yan1, YUAN Zi-zhou1, SUO Hong-li2
（1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Advanced Functional Materials,
Ministry of Education, Beijing University of Technology, Beijing 100022, China）
Abstract:Based on Cu-Zr-Al tenary alloy, the effects of addition of Ag and Fe elements on glass-forming ability and mechanical properties of Cu-Zr-Al-Ag and Cu-Zr-Al-Ag-Fe bulk amorphous systems were investigated. Cu50Zr42Al8 BMG exhibits high glass-forming ability and thermal stability in ternary alloy system, ΔTx, Trg and γ of which are 61 K, 0.624 and 0.416, respectively. The glass-forming ability of Cu-Zr-Al ternary alloy system is obviously improved with addition of Ag. In the quaternary system, Trg of Cu43Zr45Al8Ag4, Cu45Zr42Al8Ag5, Cu40Zr44Al10Ag6, Cu43Zr41Al8Ag8 and Cu36Zr48Al8Ag8 are 0.618, 0.625, 0.618, 0.628 and 0.598, γ of which are 0.424, 0.427, 0.424, 0.432 and 0.433，ΔTx of which are 77, 76, 78, 84 and 108 K, respectively. In the (Cu0.36Zr0.48Al0.08Ag0.08)100−xFex(x=0，3，5，10，15，20) quinary system, the addition of Fe exists an obvious effect on the glass forming ability of the alloys. Although the ΔTx and Trg are reduced, the (Cu0.36Zr0.48 Al0.08Ag0.08)97Fe3 bulk amorphous alloy exhibits high glass-forming ability, and ΔTx, Trg and γ of this alloy are 103 K, 0.566 and 0.424, respectively. The compressive fracture strength and plastic strain of (Cu0.36Zr0.48- Al0.08Ag0.08)95Fe5 alloy increase to 2 249 MPa and 4.9%, respectively, which shows that the addition of suitable Fe improves the mechanical properties obviously. The existence of Fe element results in the distinct phase separation in Cu36Zr48Al8Ag8 alloys, which strengthens and toughens the (Cu0.36Zr0.48Al0.08Ag0.08)100−xFex alloy.
Key words: bulk metallic glass; glass-forming ability; alloying; mechanical property
