零热膨胀金属材料研究进展

宋玉柱, 张济民, 周畅, 施耐克, 陈骏

Research Progress on Zero Thermal Expansion Metallic Materials

SONG Yuzhu, ZHANG Jimin, ZHOU Chang, SHI Naike, CHEN Jun

图9 钛基形状记忆合金各向异性热膨胀以及循环性能[40~42]

Fig.9 Anisotropic thermal expansion and cyclic properties of titanium-based shape memory alloys[40-42] (a) evolution of macroscopic strain with temperature of rolled 60% (thickness reduction rate) Ti50.6Ni49.4 alloy sheet along RD, 22.5°, 33.5°, 45°, 67.5°, and TD after annealing for 60 min at 523 K[40] (RD—rolling direction, TD—transverse direction) (b) Ni50.8Ti49.2 alloy through three steps rolling (CroR-15%-10%-5%: the thickness of the first rolling direction is reduced by 15%-the thickness in the vertical direction from the first rolling direction is reduced by 10%-thickness is reduced by 5% along the first rolling direction) to a thickness of 30% of the total thickness after the internal macroscopic thermal expansion change[41] (CroR—cross rolling, TE—thermal expansion) (c) Ti22Nb CR (cold-rolled) plate along the rolling direction in eight cycles (cycle 01 Tmax (maximum temperature) = 350 oC, thermomechanical analyzer measurements were performed in cycle 02-08 at Tmax = 300 oC)[42] (Inset shows the transmission Kikuchi diffraction (TKD) band contrast (BC) + inverse pole figure (IPF) map inside a primary martensite lath in the sample heating to 350 oC)