Research Development Corporation of Japan

Other

Yamaha Corporation

Ykk Corporation

Teikoku Piston Ring Co., Ltd.

Yoshiyuki Shinohara

Akihisa Inoue

Tsuyoshi Masumoto

Tao Zhang

Kazuhiko Kita

Hisamichi Kimura

Yuma Horio

An alloy material 4 received in a melting hearth 1 is melted by high-density energy supplied from a heat source 5. The molten alloy is transferred to a forced-cooled die 3 having a cavity 2 defining the profile of a product, and quenched to an amorphous state. The alloy has the composition represented by the general formula of Zr.sub.100-a-b-c A.sub.a B.sub.b C.sub.c, wherein the mark A represents one or more elements selected from Ti, Hf, Al and Ga, the mark B represents one or more elements selected from Fe, Co, Ni and Cu, the mark C represents one or more elements selected from Pd, Pt, Au and Ag, and the marks a-c represent the atomic ratios of respective elements A-C under the conditions of a=5-20, b=15-45, c.ltoreq.10 and a+b+c=30-70. The differential temperature region .DELTA.T (=T.sub.x -T.sub.g) in the supercooled liquid phase of the Zr alloy represented by the difference between the crystallization point T.sub.x and the glass transition point T.sub.g is preferably 100 K or more. The obtained amorphous alloy has a rod-shaped or tubular profile having a large cross section and being excellent in plastic workability.

Rod-shaped or tubular amorphous Zr alloy made by die casting and method

An alloy material 4 received in a melting hearth 1 is melted by high-density energy supplied from a heat source 5. The molten alloy is transferred to a forced-cooled die 3 having a cavity 2 defining the profile of a product, and quenched to an amorphous state. The alloy has the composition represented by the general formula of Zr.sub.100-a-b-c A.sub.a B.sub.b C.sub.c (wherein the mark A represents one or more elements selected from Ti, Hf, Al and Ga, the mark B represents one or more elements selected from Fe, Co, Ni and Cu, the mark C represents one or more elements selected from Pd, Pt, Au and Ag, and the marks a-c represent the atomic ratios of respective elements A-C under the conditions of a=5-20, b=15-45, c.ltoreq.10 and a+b+c=30-70. The differential temperature region .DELTA.T (=T.sub.x -T.sub.g) in the supercooled liquid phase of the Zr alloy represented by the difference between the crystallization point T.sub.x and the glass transition point T.sub.g, is preferably 100 K or more. The obtained amorphous alloy has a rod-shaped or tubular profile having a large cross section and being excellent in plastic workability.

A high strength aluminum-based alloy, which having a composition of the general formula: Al.sub.bal Q.sub.a M.sub.b X.sub.c T.sub.d, wherein Q represents at least one element selected from the group consisting of Mn, Cr, V, Mo and W; M represents at least one element selected from the group consisting of Co, Ni, Cu and Fe; X represents at least one element selected from rare earth elements including Y or Mm; T represents at least one element selected from the group consisting of Ti, Zr and Hf; and a, b, c and d represent the following atomic percentages: 1.ltoreq.a.ltoreq.7, 0&gt;5, 0&gt;c.ltoreq.5 and 0&gt;d.ltoreq.2, and contains quasi-crystals in the structure thereof. The alloy of the present invention is excellent in the hardness and strength at both room temperature and a high temperature, and also in thermal resistance and ductility. In addition, it is usable as a high specific strength material having a high strength and a low specific gravity due to a small amount of addition of rare earth element or elements.

High strength aluminum-based alloy

Growing community of inventors

Sendai, Japan

Yoshiyuki Shinohara