一、前 言 以往可供大量生产的金属成形工艺有两种:一种采用完全呈液态的金属成形,例如普通铸造;一种采用完全是固态的金属成形,诸如锻造、粉末冶金等。而美国在七十年代初期研究成功一种既非全呈液态,又非全呈固态的固—液态金属混合浆料铸造成形法,即具有流变性和触变性的半固态金属浆料铸造成形法。这种方法称之为流变铸造(Rheocasting)。 I. INTRODUCTION In the past there were two metal forming processes that were available in mass production in the past: one with fully liquid metal forming such as normal casting; and one with completely solid metal forming such as forging, powder metallurgy and the like. In the early 1970s, however, the United States succeeded in researching a solid-liquid metal mixed slurry casting method, which is neither a solid solution nor an all-liquid solid slurry casting method, ie, a semi-solid metal slurry casting method with rheology and thixotropy . This method is called rheocasting.