熱穩(wěn)定性和力學(xué)性能
( 南京理工大學(xué) 金屬納米材料與技術(shù)聯(lián)合實(shí)驗(yàn)室, 南京 210094)
摘 要: 采用差壓鑄造法成功制備了Cu47Ti34Zr11Ni8塊體非晶合金， 研究了其熱穩(wěn)定性和力學(xué)性能。 結(jié)果表明： 該塊體非晶合金的玻璃轉(zhuǎn)變溫度Tg=672 K， 晶化溫度Tx1=735 K， 過(guò)冷液相區(qū)ΔTx=63 K, 約化玻璃溫度Trg=0.575， 彎曲斷裂強(qiáng)度高達(dá)2 350 MPa， 斷裂前彈性變形量為2.1%， 彎曲模量為102 GPa； 淬態(tài)微米級(jí)結(jié)晶相的出現(xiàn)使合金的三點(diǎn)彎曲斷裂強(qiáng)度下降至1 100 MPa。
關(guān)鍵字: 塊體非晶合金； 玻璃形成能力； 力學(xué)性能
Cu47Ti34Zr11Ni8 bulk amorphous alloys
SUN Qiang-jin
（ Joint Laboratory of Nanostructured Materials and Technology,
Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract: Cu47Ti34Zr11Ni8 bulk amorphous alloy was prepared by differential pressure casting. Thermal stability and mechanical properties were studied. The results show that the glass transition temperature(Tg), crystallization temperature(Tx1), temperature interval of supercooled liquid region ΔTx(=Tx1-Tg) and reduced glass transition temperature(Trg) are proved to be 672 K, 735 K, 63 K, and 0.575, respectively. The bulk glass also exhibits high three point-bending flexural strength of 2 350 MPa, flexural modulus of 102 GPa and fracture strain of 2.1%. The three point-bending flexural strength of the alloys declines to 1 100 MPa with the appearance of a micron-size quenched-in crystallization.
Key words: bulk amorphous alloy; glass-forming ability(GFA); mechanical properties
