Research On Elevated Temperature Mechanical Properties And Friction And Wear Properties Of High Aluminum Zn-Based Alloys

High Aluminum Zn-based alloys have been applied as a new kind of non-ferrous materials in recent decades. These alloys present good casting properties, good mechanical properties, excellent wear-resisting and low cost. Thus, they have been substituted for such wear-resisting materials as brass, bronze and babbitt metal. However, the kind of alloys applied at present is less and they service only under 150*0. The present work deals with the mechanical and friction-wear properties of different Al-content Zn-based alloys at room temperature and elevated temperature(100~200 1C)The tensile strength, elongation, hardness, friction coefficient and friction-wear performance of five different Al-containting high Aluminum Zn-based alloys were carried out on material testing system, abrasion testing machine, metallographic microscope and image-analyzer at room temperature and elevated temperature, and compared with ZQPbD alloys.The results show that: (1) The microstructure of alloys is composed ofdendrite a' phase, eutectoid a + phase, phase, Mn phase andeutectic. The number of a ' phase increase and eutectoid( a + ?)phase decrease with the increasing of Al-containing. (2) The mechanical properties of high Aluminum Zn-based alloys are improved with the increasing of Al-content both at room temperature and elevated temperature. (3) With increase of sliding speed at room temperture,The friction-wear properties of Zn-Al alloys drop, whereas the properties of ZQPbD alloys were improved. The friction-wear properties of Zn-Al alloys are worse than ZQPbD alloy at 100"C. (4) The friction-wear properties of Zn-Al alloys are not satisfactory under the condition of dry-friction. However, high Aluminum Zn-based alloys have more excellent friction-wear properties under low sliding speed and over-loading than ZQPbD alloy has.Guangxi is abundant in non-ferrous mineral resources, especially in Zinc and Aluminuml. So the present work is significant for the exploitation and utilization of resources as well as the development of economy in Guangxi.